Which of the following is an r-selected species?
select one:
a. rat
b. humpback whale
c. eagle
d. elephant

The correct answer is A) Rat.

r- selected species are those, which are capable of producing large number of small offsprings in an unstable environments. These species follow exponential growth rate, does not survive to childhood ( as possess very short life span), and have no parental care.

On the contrary, k selected species are present in a stable environment, have low reproductive rate, long life span, and possess parental care. Whale, Eagle, and Elephant are the example of K- selected species.

Thus, rat is an example of r- selected species.

The correct answer is RATS.        

r-selected species have a high growth rate and produce many offspring. These offspring may or may not reach until adulthood. Other examples of r-selected species are - mice, rabbits, weeds and bacteria, which have a lot of offspring, but a short life expectancy.