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What is natural selection? (Reminder: Natural selection happens without human influence.)

• When humans choose which organisms reproduce.

• When traits are passed down without human influence.

• When organisms choose their own traits.

• When traits appear randomly with no pattern.

The part of the cell that contains chromosomes and genes is the:

• Mitochondria

• Nucleus

• Chloroplast

• Ribosomes

An example of a physical/structural adaptation is...

• a turtle hiding inside its shell

• The spikes on a porcupine fish

• a rabbit burrowing underground

• a viper biting when threatened

An animal's color or pattern that helps it blend into its surroundings

• Environment 
• Mimicry
• Camouflage

This type of organism can absorb energy directly from the environment.

• Heterotroph

• Autotroph

• Carnivore

• Chemotroph

This type of organism must go find food through hunting, gathering, or herbivory.

• Heterotroph

• Autotroph

• Carnivore

• Chemotroph

• Physiological

• Structural

• Behavioral