Why does West Africa support a wide variety of ways of life?
A The coastal area has one of the largest
cities in the world.
B The varied geography causes very
different climates.
C The countries of the interior are mostly
covered by desert.
D Human activity has altered the environment
in some places.

Select the correct answer. which mutation is harmful to the organism? a. a mutation allowing moths to camouflage better on blackened tree bark b. a mutation making staphylococcus aureus resistant to the antibiotic methicillin c. a mutation inhibiting human immunodeficiency virus from attaching to and entering the cell d. a mutation causing uncontrolled cell division e. a mutation giving plant leaves a bitter taste to discourage herbivores from eating them

Witch theory suggests all living things are made up of cell or cells

18. over time, how do sand dunes tend to migrate? a. perpendicular to the movement of the wind b. in the same direction as the wind blows c. toward the wind d. in random directions