How long will it take three quarters of a sample of a radioactive element to decay if its half-life is 4 days?
a. 2 days
b. 3 days
c. 4 days
d. 8 days
5
Another word for variation is
a. similarity
b. difference
c. adaptation
d. mutation

clumped distribution, because you'de have all of the population gathered in a relatively small are.

it's the most common because it provides protection and a mate for reproduction

example: humans, seeweed, cattles, etc.

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.