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Alja [10]
3 years ago
14

Many species of snakes lay eggs. however, in the forests of northern minnesota, where growing seasons are short, only live-beari

ng snake species are present. this trend toward species that have live birth in a particular environment is an example of _____.
Biology
1 answer:
Svetlanka [38]3 years ago
6 0

Answer;

-Species selection

-This trend toward species that have live birth in a particular environment is an example of species selection.

Explanation;

-Species selection is the process responsible for the proliferation of species that have lower extinction and higher speciation rates. Species selection is a reason why macroevolution and microevolution may be uncoupled.

-Suppose that larger-bodied species lineages tend to speciate more rapidly, and that the average rate of extinction is also less for larger species. Over time, this will result in a species trend, in which the clade becomes more speciose and each species on average larger.

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I think it is D. The National Institutes of Health found it effective in reducing pain and other symptoms, but it is not clear how it works.

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3 years ago
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Bear pigmentation is subject to epistasis of the B alleles by the d alleles. B (black) is dominant over b (brown). D is dominant
White raven [17]

Answer:

9/16 black, 3/16 brown, 4/16 white

Explanation:

             BD         Bd          bD         bd

BD     BBDD      BBDd     BbDD     BbDd

Bd      BBDd      BBdd     BbDd      Bbdd

bD      BbDD     BbDd      bbDD     bbDd

bd       BbDd    Bbdd       bbDd     bbdd

A punnet square can be described as a diagram which is made to predict the genotype as well as the phenotypes of the offsprings of a cross.

To study the epistatis nature of the pigmentation in bear, a punnet square was made and the results of the punnet square are shown above.

The results of the punnet square show that the cross between two bears will have the chances of producing 9/16 black bears, 3/16 brown bears and 4/16 white bears.

4 0
3 years ago
In cells where telomerase is normally inactive, it can become active by accident and often, cancer will develop as a result. Can
vesna_86 [32]

Answer:

Cancer cells achieve proliferative immortality by activating or upregulating the normally silent human TERT gene (hTERT) that encodes telomerase, a protein with reverse transcriptase activity that complexes with other proteins and a functional RNA (encoded by hTR, also called hTERC) to make a ribonucleoprotein enzyme.

Explanation:

A rare cell that escapes crisis almost universally does so by reactivating telomerase and this cell can now become a cancer cell with limitless potential to divide. Almost all cancer cells have short telomeres and thus inhibitors of telomerase should drive such cancer cells into apoptotic cell death. Yet, each time a cell divides, the telomeres get shorter. When they get too short, the cell no longer can divide and becomes inactive or "senescent" or dies. This process is associated with aging, cancer, and a higher risk of death.

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Stratified epithelium are identified by their
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The shape of the most apical layer of cells, closest to the free space.

Explanation:

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Y_Kistochka [10]

Answer:

Ginning

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