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nikitadnepr [17]
4 years ago
15

Describe how environmental changes can cause species to become extinct.

Biology
1 answer:
denis-greek [22]4 years ago
5 0
Many species, or at least the region they live in, need a relatively narrow set of environmental criteria to be true in order to survive.  For example, if an alligator in the Florida wetlands experiences a long-term drought, the plants that the smaller animals eat can dry up and those animals die.  Then the alligators have no animals to eat so they could die.  If this was to happen over a long period of time and on a worldwide scale, a species could become extinct.

I hope that helps.
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Which enzyme bonds to the gene’s promoter to act as a “start signal”?
Luba_88 [7]

Answer:

RNA Polymarase

6 0
3 years ago
How is the entry of bacteria with food dealt by the digestive system
alexira [117]

Enzymes in saliva kill some bacteria and protect the mouth from infection. When food reaches the stomach, much of it is sterilized by the hydrochloric acid in digestive juices. Further into the digestive tract, the friendly bacteria living in the intestines provide protection from invading bacteria

7 0
3 years ago
Place the following in the correct order as they occur in CELL RESPIRATION.
Goryan [66]
  1. Electrons and h+ ions pop off and are picked up by NADH.
  2. 1 C is stripped from 3-C PGA and makes Co2.
  3. Coenzyme A attaches to 2-C molecule making Acetyl Co-A.
  4. Resulting 3 C molecule is stabilized BEFORE entering the mitochondria.
  5. Acetyl Co-A enters mitochondria and drops off 2-C molecules.
  6. In cytosol, 6-C glucose and 2 ATP split into two 3-C molecules (glycolysis).
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5 0
3 years ago
In Holstein cattle the allele for black hair color (B) is dominant over the allele for red hair color (b), and the allele for po
torisob [31]

Answer:

A dominant trait can be described as the one which masks the effect of a recessive trait. The alleles for a recessive trait gets suppressed by the dominant one.

A punnet square can be described as a diagram which depicts the outcomes of a cross. For single traits, the cross is monohybrid. For studying two traits at a time, a dihybrid cross can be made.

The punnet square for the following Holstein cattle can be shown as:

           BP           Bp          bP             bp

BP     BBPP     BBPp     BbPP         BbPp

Bp     BBPp     BBpp     BbPp          Bbpp

bP      BbPP     BbPp     bbPP          bbPp

bp      BbPp      Bbpp     bbPp          bbpp

The results show the phenotypic ratio to be 9 black/polled : 3 black/horned : 3 red/polled : 1 red/horned

7 0
3 years ago
When is osmosis used by
Pie

Answer:

B.

Explanation:

Osmosis moves water from the part of the membrane with less solutes to the part with more solutes. This will continue until the cell or whatever it is reaches equilibrium.

8 0
3 years ago
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