Key Idea.
Section 1
The Environment is the Judge
No trait is automatically "good" or "bad." A trait's value depends entirely on the environment.
For example, white fur is an adaptive trait for a bear in the Arctic because it provides camouflage. However, that same white fur would be a disadvantage (non-adaptive) in a dark forest. The environment determines which traits are useful.
Section 2
Environmental Pressures
Environments are difficult places to live. Organisms face environmental pressures, such as predators, lack of food, or harsh weather.
These pressures create a struggle for survival. Because of variation, not all individuals struggle equally. Those with adaptive traits (like higher poison) are better equipped to handle the pressure than those without them.
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Section 1
The Environment is the Judge
No trait is automatically "good" or "bad." A trait's value depends entirely on the environment.
For example, white fur is an adaptive trait for a bear in the Arctic because it provides camouflage. However, that same white fur would be a disadvantage (non-adaptive) in a dark forest. The environment determines which traits are useful.
Section 2
Environmental Pressures
Environments are difficult places to live. Organisms face environmental pressures, such as predators, lack of food, or harsh weather.
These pressures create a struggle for survival. Because of variation, not all individuals struggle equally. Those with adaptive traits (like higher poison) are better equipped to handle the pressure than those without them.
Book overview
Jump across lessons in the current chapter without opening the full course modal.
Continue this chapter