Which of the following is an r-selected species?

a)rat
b)humpback whale
c)eagle
d)elephant

it is a)

The correct answer is- A) Rat.

R selected species are those species that can survive in unstable, unpredictable environmental conditions and produce large number of small size offspring ( with low survival rate and no parental care).

These species grow very rapidly and attain reproductive maturity at early stage in their lives.

Example- Insects, rats.

On the contrary, B) , C), and D) are K selected species that survive under stable environmental conditions and produce large size offspring with very few number ( having long life span and parental care).

mammal

explanation:

the correct answer is - d. china has a large and growing population.

the fact that china has a large (the biggest) population, and it is still growing, doesn't hinder the agriculture production in the country. in fact, it can for increased production in the agriculture, since there's more labor force, as well the sheer mass of people produces lots of scientists that come up with new inventions as to how to improve this sector. nice example is the inner mongolia region in china, in general dominated by the gobi desert, but few scientist came up with a nice idea as to how to make the region productive by using plants that are very resistant to droughts, so lots of people have been employed, and the region is becoming greener and greener each year, and the production of food in this region is also increasing.