Which biome is characterized by evergreen vegetation and drought-adapted animals?

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?

Which scientist proposed that a population is a group of individuals of the same species?

What is the most important factor for the success of an animal population?

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