Why didn’t Darwin think you could observe natural selection in a lifetime?

There aren't enough generations visible within a lifetime to have any visible changes or evidence of natural selection. Essentially, evolution takes much longer than 1 lifespan to happen.

d) center of the mid-ocean ridge

give brainleysest

sinserly,

steckh986

succession returns a disturbed

ecosystem to a more stable state. this is also classified into two (2) types:

primary succession and secondary succession. the primary succession arises when

a new land is transformed and a bare rock has been exposed providing an environment

that can be occupied for the first time. while, secondary succession occurs

when a previously occupied environment was disturbed that kills much of all its

community

explanation: