what are three reasons why gene expression might vary across time and across different parts of the body?

Answer: D

Explanation: D is the only one that is an actual observation. The other options are inferences and don’t just state the facts.

Answer:

The first one has to be the answer

Explanation:

If the area had once been covered by ice or snow, then there would be no place to get the warm leaf from.

If the area was once underwater then I don't know how it would have grown a cold forest, a tropical forest, and then a desert.

It'd make more sense if you started with a cold forest with sharp leaves, that slowly became a warmer forest with smooth leaves, only so it could become a dessert with only leaf fossil remains.

so ya the first one is your answer.

The climate changed from cool forest to hot desert is the hypothesis which can be concluded.

This can be defined as a proposed explanation for a particular phenomenon through various sources.

We were told that  the toothed-edged leaf is from a forest in a cooler climate but was found in the desert which therefore means that the  climate changed from cool forest to hot desert.

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Answer:

Yes I would based on the fact they are both mammals

Explanation:

common sense

The A:T:G:C ratios in DNA of cattle and rat being similar does not necessarily mean that their tRNA, tRNAs, and mRNAs will also be similar.

While the DNA sequence provides the blueprint for the production of RNA and proteins, it is the specific sequences of the RNA and proteins that determine their function and structure. The genetic information encoded in the DNA is transcribed into RNA, and the RNA is then translated into proteins. This process is subject to various levels of regulation and modification, including alternative splicing and post-translational modifications, which can result in different functional outcomes even when the DNA sequences are similar. Therefore, similarities or differences in the tRNA, tRNAs, and mRNAs of cattle and rat will depend on the specific sequences of these RNA molecules, rather than the A:T:G:C ratios in their DNA.

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The chemical reaction for cellular respiration will be C6H12O6 + 6 O2 → 6 CO2 + 6 H2O, the correct option is C.

Cellular respiration is a succession of chemical reactions that break down glucose to produce ATP, which can then be used as energy to power a variety of reactions throughout the body.

Cellular respiration consists of three major steps: glycolysis, the citric acid cycle, and oxidative phosphorylation.

It is mirror image of photosynthesis, its chemical reaction is:

\(C_{6} H_{12}O_{6} + 6 O_{2}--------- > 6CO_{2}+6O_{2}\)

Thus, the correct option is C.

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Answer:

el enunciado hace referencia a estructuras análogas

Explanation:

La estructuras análogas (por ejemplo, órganos, tejidos, etc) son aquellas que cumplen la misma o similares funciones pero que poseen un origen evolutivo distinto (es decir, no comparten un antepasado común) y son producto de la convergencia evolutiva. Por el contrario, estructuras homólogas son aquellas que se caracterizan por tener un origen evolutivo común (comparten un antepasado común), independientemente de la función que cumplan. Las estructuras análogas se caracterizan por tener diferentes orígenes embrionarios y planes de construcción distintos (es decir, las células que dan origen a este tipo de estructuras son de linajes diferentes). Un ejemplo bien conocido de estructuras análogas son las alas de mariposas y murciélagos, las cuales cumplen la misma función pero no derivan de un antepasado común.

Answer:

they are not from the land that they are currently residing in

they destroy the ecosystem of the habitat they are currently in, as in they harm the native animals by eating all their food, eating them, etc.

they take up space too

Explanation:

Answer:

ATP, RNA, NAD and DNA.

Explanation:

A nitrogenous base; it is an organic molecule containing a nitrogen, carbon and other atoms that has the chemical properties of a base that is why they are called as bases. The nitrogenous bases are; i) adenine, ii) guanine, iii) thymine, iv) uracil and v)cytosine.

Adenine is a nitrogenous base which is found in ATP, RNA. NAD, FAD and DNA. adenine pairs with thymine in DNA synthesis.

Answer:

Both physical and chemical factors

Explanation:

A mutation is any alteration in the DNA sequence of the genome of a particular cell/organism. Depending on the type and localization, a mutation can be neutral, deleterious, or even beneficial for the individual that possesses it. Moreover, the mutation rate refers to the probability for a mutation to appear in a cell/organism. Exposure to physical environmental factors (e.g. ultraviolet radiation, X-rays, gamma rays, etc) and chemical factors (e.g., bromine) can increase this likelihood.

Answer:

physical and chemical factors

Explanation:

Factors that alter the critical chemical and physical characteristics of ecological systems include temperature, pH electrochemical (redox) potential, and the transparency of air and water.

Answer:

Natural selection favors the strongest and fastest individuals in a population

Beneficial traits are passed on to future generations

There is genetic variation in populations

Explanation:

I just did this last trimester in natural science.

Answer: dehydration of proteins.

Explanation:

Photosynthesis is a complex process that can be summarized in two key steps: the light-dependent reactions and the light-independent reactions (also known as the Calvin cycle).

In the light-dependent reactions, light energy is converted into chemical energy in the form of ATP and NADPH. In the light-independent reactions, ATP and NADPH are used to convert carbon dioxide into glucose.

During the light-dependent reactions, light energy is absorbed by chlorophyll and other pigments in the chloroplasts of plant cells. This energy is used to split water molecules, releasing oxygen as a byproduct.

The energy from the absorbed light is then used to convert ADP (adenosine diphosphate) into ATP (adenosine triphosphate) and NADP+ (nicotinamide adenine dinucleotide phosphate) into NADPH. These energy-rich molecules, ATP and NADPH, are essential for the next step.

In the light-independent reactions, also known as the Calvin cycle, carbon dioxide enters the chloroplasts and combines with a five-carbon compound called RuBP (ribulose-1,5-bisphosphate). This process is facilitated by the enzyme RuBisCO (ribulose-1,5-bisphosphate carboxylase/oxygenase).

The resulting unstable six-carbon molecule quickly breaks down into two molecules of a three-carbon compound called PGA (phosphoglycerate). ATP and NADPH from the light-dependent reactions provide the energy and reducing power to convert PGA into PGAL(phosphoglyceraldehyde) through a series of enzymatic steps. Some PGAL molecules are then used to regenerate RuBP, while others combine to form glucose and other organic compounds.

Overall, photosynthesis is a remarkable process where plants capture light energy and convert it into chemical energy in the form of glucose, which serves as a fundamental energy source for both plants and other organisms in the food chain.

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Answer:

I think.... option A is correct

Answer:

antibiotic resistant is a consequence of evolution via natural selection. the antibiotic action is an environmental pressure;those bacteria which have a mutation allowing them to survive will live on to reproduce

please mark me as brainlist please

Answer:  D

Explanation:

Answer:

Maybe A/B

Explanation:

The Nature Conservancy forms large preserves by combining donations,exchanges,and purchases of land.

I think it's correct?

Answer:

Explanation:

The reason is that the ultra violet Ray from the sun. This UV emissions from the sun is dangerous to the skin as it damage the genetic material or DNA . If there is much build up damage to the cells, it can lead to the cells to continue to grow or replication without control or uncontrollable and hence can result to cancer.

Answer: 25 percent

Explanation:

The diameter of a capillary tube is 2.5135m

Capillary tubes are those with very small diameters (narrow cylindrical tubes). When these small tubes are immersed in a liquid, the liquid in the capillary either rises (or lowers) relative to the surrounding liquid level. This phenomenon is known as capillary action, and such tubes are known as capillary tubes.

Rise in capillary is given by

h = \(\frac{2\times \sigma \times cos\theta}{\rho \times r\times g}\)

σ = surface tension

ρ = density of liquid

r = inner radius

h = height

θ = contact angle made by the liquid meniscus with the capillary’s surface.

Given,

h = 1.21 cm

σ = 540 × 10 N/m

θ = 140°

ρ = 13.6 × 10³ Km

Substituting the value in equation,

h = \(\frac{2\times \sigma \times cos\theta}{\rho \times r\times g}\)

r = \(\frac{2\times 540\times10\times cos140}{13.6\times10^3\times1.21\times10^-^2\times10}\)

r = 50.27 × 10⁻¹m

d = 2.5135m

The diameter of a capillary tube is 2.5135 m.

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The keys are:

1. I. Fish with bones

II. Fish without bones

2. I. Fish with flat bodies

II. Fish without flat bodies

3. I. Fish with dark bodies

II. Fish without dark bodies.

4. I. Fish with scales

II. Fish without scales

Fish are gill-bearing, aquatic, craniate creatures that lack digitized limbs. The live hagfish, lampreys, cartilaginous and bony fish, as well as numerous extinct related groups, are included in this concept.

Fish can be divided into three primary categories: cartilaginous fish (Osteichthyes), jawless fish (Agnatha), and bony fish (Osteichthyes).

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Answer:

least specific- Domain, Kingdom, Phylum, Class, Order, Family, Genus, Species - most specific

Explanation:

Dear King Phillip Came Over For Good Soup

Answer:

D.,A.,C.

Explanation:

Answer:

a,c,d

Explanation:

Answer:

Conflict can help to build a positive relationship between parents and youth due to the fact that conflict can lead to communication. When conflict arrives you need active listening, communication, and responsibility to approach any issue that may occur.

Explanation:

Answer:

1) Mutations: Bacterial mutations can occur spontaneously and alter the DNA of the bacterium, leading to changes in its characteristics and potentially leading to the development of a new strain.

2) Horizontal gene transfer: Bacteria can exchange genetic material with other bacteria through mechanisms such as conjugation, transduction, or transformation. This can result in the transfer of virulence factors, antibiotic resistance genes, or other traits that contribute to the development of new strains.

3) Antibiotic resistance: The overuse and misuse of antibiotics can lead to the selection and spread of antibiotic-resistant strains of bacteria. This can result in the emergence of new strains that are resistant to multiple antibiotics and pose a significant public health threat.

One important difference between amniocentesis and chorionic villus sampling (CVS) is the timing at which they can be performed during pregnancy. Amniocentesis is typically performed between 15 and 20 weeks of pregnancy, while CVS can be done earlier, between 10 and 13 weeks.

The reason for this difference is that amniocentesis involves removing a small amount of amniotic fluid from the sac surrounding the developing fetus, which contains fetal cells that can be analyzed for genetic abnormalities. In contrast, CVS involves taking a small sample of placental tissue, called chorionic villi, which also contain fetal cells. Because the placenta develops earlier than the amniotic sac, CVS can be performed earlier in pregnancy. Another difference is that CVS has a slightly higher risk of miscarriage compared to amniocentesis, although the overall risk for both procedures is relatively low. Ultimately, the decision of which procedure to choose depends on various factors, such as maternal age, family history of genetic disorders, and personal preferences.

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During the Cretaceous period, high temperatures and abundant vegetation resulted in increased \(CO_2\) levels, leading to the accumulation of organic matter and the formation of good source rocks for oil and gas.

During the Cretaceous period, spanning from approximately 145 to 66 million years ago, the global carbon-climate cycle played a crucial role in the development of favorable conditions for the formation of good source rocks. The period was characterized by high global temperatures and abundant vegetation, resulting in increased carbon dioxide \((CO_2)\) levels in the atmosphere.

The elevated \(CO_2\) levels fueled vigorous photosynthesis, leading to the accumulation of organic matter in marine and terrestrial ecosystems. As this organic matter was buried and subjected to heat and pressure over millions of years, it transformed into oil and gas, creating potential source rocks. The warm climate and prolific vegetation during the Cretaceous, along with the subsequent geological processes, contributed to the formation of the rich hydrocarbon reserves that are vital to our energy resources today.

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The correct question is:

Explain the global carbon-climate cycle during the Cretaceous period. (Write only one paragraph describing what happened during the Cretaceous geological period in order to have good source rocks.)

Answer:

Ribosomes are found in the cytoplasm or bound to the endoplasmic reticulum (ER) to form rough ER in a cell. They are found in both prokaryote and eukaryote cells.

Explanation: