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3 years ago

Imagine that a layer of leaves is scattered along a forest floor; what must happen in order to preserve these leaves as fossils?

2 answers:

6 0

For the leaves to be presearved as fossil, they have to undergo a natural process of carbonization. This involves a slow chemical reaction with water over time that allows oxygen, nitrogen, and hydrogen to escape the leaves’ structure as gases leaving behind a carbon skeleton/film.

seraphim [82]3 years ago

3 0

To preserve the leaves that are put in a forest floor the leaves have to be dehydrated and put in 10% formalin.

Explanation:

The tissues or any organelles that are got form any organism contains a lot of hydration in them; it is the water content that makes them vulnerable to contamination.

In order for the leaves to remain like fossils, they must be naturally carbonated. This involves a slow chemical reaction with water, allowing oxygen, nitrogen and hydrogen to escape from the leaf structure as the gas leaves the carbon atoms.

The contamination is caused by the bacteria that grow on these leaves by feeding on the hydration and organic content of the material, when this is fixed using an organic solvent then there is no room for contamination.

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Which of the following statements is a correct explanation for the observation that all offspring exhibit a phenotype for a part

bearhunter [10]

Answer:

D) Neither of the parental genes is dominate over the other.

Explanation:

Since the trait on the offspring is a mixture from both parent, it means that neither of the alleles from both parents is completely dominant over the other. Instead, each of the alleles contributes equally to the trait of the offspring.

This effectively explains the fact that each trait exhibited by offspring is a blend of the traits from the two parents.

The correct option is D.

8 0

4 years ago

Are humans affected by natural selection?

Scorpion4ik [409]

Yes! A recent example could be babies that do not survive child birth for a certain reason, are obviously unable to pass on whatever caused them to die in the first place.
Also, once humans started to domesticate cows and drink their milk (I'm not sure why humans drink a cow's milk) their bodies evolved to continue making the enzyme to digest milk even after they were weaned off their mothers milk. Many people of Asian descend do not have this enzyme, since their culture did/does not raise as much dairy product.

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3 years ago

20 minutes of moderate cardiovascular exercise releases bdnf. a. True b. False

Sauron [17]

The answer is true letter a

7 0

3 years ago

A mouse had a gene sequence of GTT coding for leucine, an amino acid. mutation in this gene led to the formation of GTG. However

Sergeu [11.5K]

Answer:

1- substitution.

2- neutral.

Explanation:

The change in the genetic sequence of the organisms known as mutation. Mutations might be sudden and heritable in nature. spontaneous mutation and induced mutation are types of mutation.

A change that causes a change in single base pair of a gene sequence is called substitution mutation. The original leucine sequence is GTT and the mutated sequence is GTG. Thus T has been substituted by G.

Mutation can be beneficial, detrimental or neutral. The neutral mutation is that does not affect the physical change. Both GTT and GTG code for the same amino acid so it would be neutral.

8 0

3 years ago

The hypothalamus functions in: A) coordinating movement. B) regulating the autonomic nervous system. C) secreting a hormone call

Dmitriy789 [7]

Answer:

B is my answer

Explanation:

correct me if im wrong and i hope it helps

7 0

3 years ago