In ferns the archegonia and antheridia develop on
a. the tip of the gametophyte.
b. the underside of the gametophyte.
c. the roots of the gametophyte.
d. the underside of the sporophyte.

What is the next step in the process after a substrate enters the active site of an enzyme

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

Which hormone is used by both males and female?