Does not affect organisms within an ecosystem
Exocytosis is the correct answer. Zymogens like pepsinogen are leaving, not entering the cell, so it's not exocytosis. They are too large for channel protein transport or simple diffusion. They are "shipped" outside the cell via vesicular transport into the gastric lumen, where catabolism of proteins can begin.
Starlight travels through space by radiation which moves in waves at the speed of light, which is close to almost 300,000 kilometers per second. As space is vast and continuing to expand, the starlight that we see may have been travelling millions of years already, with the actually star already extinct.
Answer:
The answer of part A is asexual reproduction and the answer is part B is meiosis.
Explanation:
A kind of reproduction by which emergence of offspring takes place from a solitary parent, and receive the genes of that parent only is known as asexual reproduction. In the process, the combination of gametes does not take place, and at the same time the chromosomes number almost never changes, that is, it remains the same.
Gametes are produced by a kind of cell division known as meiosis. This two-step division procedure generates four daughter cells, which are haploid. The haploid cells comprise only one set of chromosomes. When the fusion of male and female gamete takes place the process is known as fertilization, which further gives rise to a zygote.