Changes in the body form of some planktonic animals with seasonal changes in temperature are grouped under

Species which occupy a similar ecological niche in similar communities occupying different biogeographical regions are called:

Nektons are

What is adaptation? Explain with examples how various organisms show adaptations to cope with specific environmental conditions.

The treeless biome of cold climates is:

Consider the following four statements regarding certain desert animals like the kangaroo rat:
$(a)$ They have a dark color,a high rate of reproduction,and excrete solid urine.
$(b)$ They do not drink water,breathe slowly to conserve water,and their body is covered by thick hair.
$(c)$ They use dry seeds as food 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 for such animals?