Evolution by natural selection.
survival of the fittest=natural selection
Answer:
Pepsinogen is produced by chief cells and is activated by hydrochloric acid secreted by parietal cells.
Explanation:
Pepsinogen is a proenzyme produced in the chief cells (that are located in the stomach lining) that, when gets activated, is transformed into pepsin - a peptidase with the function to degrade proteins into amino acids.
The reason why pepsinogen is released inactive is that it would break down all of the cell's proteins because of its proteolytic nature. For this reason, it is released as a proenzyme and gets activated when reaches the acidic environment provided by the hydrochloric acid secreted by the parietal cells, also in the stomach lining.
Answer:
The most effective experimental approach to assess the effects of elephant impact on vegetation is to assess plant responses under differences in elephant density. It is important that other factors, such as soils or habitat structure are held constant so that the only factor which varies is elephant density.
Explanation:
source: Studying Elephants icun.org
Answer:A
Explanation:Ice on the leg for 20 minutes has no effect on the prevention of DVT
The right option is lateral
corticospinal tract
The lateral corticospinal tract functions
in the control of distal muscles such as those of the limbs and the trunk. About
90% of the fibers that travel in the corticospinal tract are found in the
lateral corticospinal tract which makes it the main component of the corticospinal
tract.
