Natural selection leads organisms to become adapted to their environment over time. Using the concept of natural selection, explain how the giraffe most likely came to have such a long neck.

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

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

Why do we perceive objects as retaining their brightness under different lighting levels?