Most animals are tree dwellers in a

In which of the following natural habitats is it possible for only one type of species to reside?

Which one of the following is one of the characteristics of a biological community?

How is diapause different from hibernation?

The aquatic organism that can actively swim at will against the water current is

Consider the following four statements $(a-d)$ regarding certain desert animals like the kangaroo rat:
$(a)$ They have a dark color and high rate of reproduction and excrete solid urine.
$(b)$ They do not drink water,breathe at a slow rate to conserve water,and their body is covered with thick hair.
$(c)$ They feed on dry seeds and do not require drinking water.
$(d)$ They excrete very concentrated urine and do not use water to regulate body temperature.
Which two of the above statements are true?