The answer could be the fact that all species posses 23 universal proteins. These proteins vary slightly in some DNA sequences but are pretty much the same. These proteins are responsible for tasks such as DNA replication and translation from DNA to proteins. These activities are crucial to all forms of life. The presence of these universal proteins suggest that modern life evolved from a single common ancestor.
These lines (there is four of them) are residuals of the fusion of the five sacrum vertebrae that are fused. These "vertebrae" or segments present a characteristics, being the first of them very similar to a lumbar vertebra, large, and the other vertebrae are<span> progressively smaller and flattened. They also present a curved shape being anteriorly concave.</span>
Answer:
B) Regurgitation
Explanation:
Regurgitation refers to the backward flow of blood due to any reasons. Presence of atrioventricular valves between atrium and ventricle prevents the regurgitation, that is backward flow of blood. Structural or functional damage of any atrioventricular valves does not allow them to prevent the regurgitation.
Example: Valvular insufficiency is the condition wherein the cusps of the valves (mostly the mitral valve) become stiff and leads to backward flow of blood.
Answer:
Mutations must not occur to introduce new alleles to the population. No gene flow can occur to increase variability in the gene pool. A very large population size is required to ensure allele frequency is not changed through genetic drift. Mating must be random in the population.
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