Answer:
The return of blood to the heart is assisted by the action of the skeletal- muscle pump. As muscles move, they squeeze the veins running through them. Veins contain a series of one-way valves, and they are squeezed, blood is pushed through the valves, which then close to prevent backflow.
Answer:
A separation of a species or population so that they no longer interbreed and evolve into two separate species.They must mate with other species; the gene pools of two populations must become separated, or reproductively isolated.
Explanation:
Interspecific competition occurs between antelopes and elephants.
The term "competition" refers to the process that takes place among many species as they fight for the same limited resources in order to maintain their own existence. This struggle over resources occurs among organisms because these species occupy niches that overlap, and as a result, they are compelled to use the same resources like food, water, and shelter.
Competition can be either interspecific or intraspecific. The term "interspecific competition" refers to a type of competition that occurs between various species that live in the same biological area and are dependent on the same source of food.
In the question, both antelopes and elephants feed on the same grass and shrub species. Therefore they compete amongst themselves as a result of which their fitness is reduced.
Learn more about the interspecific competition here:
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Answer:
a. Acetyl-CoA
Explanation:
Pyruvate is decarboxylated in the matrix of mitochondria and loses its carbon as CO2. This decarboxylation is accompanied by its oxidation as well. This process of oxidative decarboxylation of pyruvate is catalyzed by an enzyme complex. It is called the pyruvate dehydrogenase enzyme complex. NAD+ accepts the released electrons and pyruvate is converted into energy-rich acetyl CoA which in turn enters into the Kreb's cycle.
