Answer:
pioneer species
Explanation:
Species that arrive first in the newly created environment are called pioneer species, and through their interactions they build a simple initial biological community. This community becomes more complex as new species arrive.
I think it is A. but don't take my word for it.
Those that produce asexually would have an advantage. If the changing environment causes some of a species to die off, the organism that produces sexually would have a lesser chance of reproducing enough to keep the species alive and thriving. Those that produce asexually wouldn't need a partner to reproduce with meaning that even if some of the species were to die off they could still reproduce with no problem. Hope this helps :)
The order of these structures from smallest to largest is cells, tissues, organs, organ systems.