Which of the following statements best describes how different environments influence evolution?

• A. They apply identical selective pressures regardless of organism.
• B. They do not affect skeletal traits.
• C. They apply different selective pressures on the shape of animal bodies.
• D. They only affect coloration, not morphology.

Answer: (C)

Environments create different selective pressures that shape how organisms evolve. Natural selection acts on heritable variation, so traits that help an organism survive and reproduce in a given setting become more common there. Because surroundings vary—from deserts to forests to seas—the pressures on body form change, pushing evolution toward different shapes and structures that work best in that specific environment.

That idea fits this statement because it recognizes that local conditions guide which body plans are favored. For example, streamlining in aquatic environments reduces drag, limb proportions and grip improve climbing in trees, and body size or limb configuration can help with heat management or resource gathering in a desert. While coloration can be important for camouflage or signaling, many morphological traits beyond color—such as bone structure, limb length, and overall body plan—are also shaped by environmental demands.

Understanding this helps explain why populations in different habitats can look quite distinct: they’re adapted to the particular challenges and opportunities their environments present.