What is homeostasis? Define aestivation.

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?

Why are small-sized animals rarely found in polar regions?

Plants growing on sand and gravel are called

Select the correct statement with respect to adaptations.

Which feature of an elephant suggests that it is an animal of a hot climate?