B : Stomach
C : Esophagus
b. chrysophyta
c. phaeophtya
d. rhodophyta
evolution
genetic variation
natural selection
Genetic variation is brought about by mutation, genetic recombination, and gene flow in a population. Therefore, option (C) is correct.
The differences in DNA sequences that exist between individuals within the same group are referred to as genetic variation. Both germ cells, which include sperm and eggs, and somatic cells, which include all other types of cells, are subject to variation.
One source of genetic variation is mutations, which can be defined as any alteration in the sequence of genes found in DNA. Gene flow, which can be defined as the movement of genes across various groups of organisms, is still another source. The final cause of genetic diversity is sexual reproduction, which results in the formation of new gene combinations and can be a consequence of sexual reproduction.
Learn more about genetic variation, here:
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Answer:
genetic variation
Explanation:
I took the test
b. secondary consumer.
c. primary consumer.
d. tertiary consumer.
Answer: Hemostasis includes three steps that occur in a rapid sequence:
Explanation: 1) vascular spasm, or vasoconstriction, a brief and intense contraction of blood vessels; (2) formation of a platelet plug; and (3) blood clotting or coagulation, which reinforces the platelet plug with fibrin mesh that acts as a glue to hold the clot.
or:
The Blood Clotting Process
Injury. A small tear in a blood vessel wall (for example, from a cut on the skin or an internal injury) causes bleeding.
Vessel constriction. To control blood loss the blood vessel narrows (called constriction), thus limiting blood flow through the vessel.
Platelet plug. ...
Fibrin clot.
The nucleus of the cell directs cell activity and acts like the control center.