Animals also choose their ... nearly all females in a population mate and have offspring, but relatively few males mate successfully (Figure 2). Those males that do mate tend to mate with many ...

All animals need to make copies of themselves ... Although some very simple kinds of creatures, like bacteria, do simply make copies of themselves. They just divide in two, and that's that.

When two organisms typically do not interbreed with one another, they are considered different ... In animals with two sexes, the potential partners must signal when they are ready to mate or ...