what is the best description of the beginning of secondary succession? 1 plants are already present
2 pioneer species appear
3 it begins on rock formations
4 soil is already present

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

Which flexible structure that supports the nerve cord and led to the backbone

Which best describes this behavior? it is beneficial only to the males that do not fertilize eggs. it is beneficial only to the female workers that are not fertilized. it is beneficial to each one of the individual colony members. it is beneficial to the whole species, but not to all of the individual members.