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3 years ago

Where do fossil fuels come from and are the renwable or non rewnable

2 answers:

8 0

Fossil fuels come from decayed plants and animals formed hundreds of million years ago. Ex: Coal, Oil, Natural Gas.

They are Non Renewable

lyudmila [28]3 years ago

7 0

Fossil fuels come from exactly that the ground in which fossils are found. They are not renewable.

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One example of scientists taking different approaches that lead to the same result is

insens350 [35]

Two scientists testing different hypotheses about the same question

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2 years ago

The smokestacks at this factory are releasing pollution into the

Pachacha [2.7K]

Answer:

environmental source

Explanation:

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8 0

3 years ago

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In humans, dimples (D) are dominant over no dimples (d). Curly hair (A) is dominant over

jeyben [28]

Answer:

1. ddaa

2. DdAa

3. One from each parent

4. False

5. 0.25

6. 0.25

7. 0.25

8. 0.5

Explanation:

The remaining part of the question is

1. What is Jane's genotype?

2. What is Paul’s genotype?

3. Where did Jane get her gene for curly hair? From her mother or father?

4. True or False: Jane's mother was heterozygous for curly hair?

5. What fraction of Paul and Jane's children should have curly hair and dimples?

6. What fraction of their children would have straight hair and no dimples?

7. What fraction should have dimples but not curly hair?

8. What is the probability of getting any offspring with dimples

Solution

1. Genotype of Jane's mother -ddaa

2. Genotype of Paul (heterozygous for dimples and curly hair) – DdAa

3. One “a” gene from mother (whose genotype for hair was aa) and second “a”gene from father (whose genotype was Aa)

4. False. She was having straight hair

5. Offspring of Paul and Jane

DdAa (4), Ddaa (4), ddAa(4) and ddaa (4)

4 out of 16 offspring will have curly hair and dimples = 0.25

6. ddaa, 4/16 = 0.25

7. Ddaa , 4/16 = 0.25

8. Ddaa, DdAa, 8/16 = 0.5

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3 years ago

Cells undergo differentiation during embryonic development. An individual skin cell develops differently from a muscle cell beca

Anni [7]

An individual skin cell develops differently from a muscle cell because the cells express different genes.
All the given cells present in the body, be it skin or muscle cells have the same DNA and the same set of genes. However, these cells are able to develop differently from each other due to the differential expression of their genes.
Differential expression of genes means that the different cells which perform different function although have the same set of genes, express different genes at different times and thus, look and function differently.
Skin and muscles cells also express a different set of genes and thus they develop differently from each other.

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3 years ago

What is the MAIN way the skin prevents pathogens from entering the body?

Novosadov [1.4K]

T<span>he MAIN way the skin prevents pathogens from entering the body is B. by acting as a barrier.
Our skin is a barrier between blood and tissues inside and everything found outside of our body. The skin protects us from various kinds of pathogens by shielding us from them.
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3 years ago

Read 2 more answers