Which of the following might be a density-dependent limiting factor for a group of perch in a lake?
A)water pH
B)amount of prey
c)surrounding temperatures
D)soil quality

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.

not necessarily. higher fitness requires the organism to be reproductive successful. for example, an organism at age 10 with 15 offspring is much more fit than an organism at age 15 with only 5 offspring.