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Variations
slight differences in inherited traits among individual members of a species
How do variations affect organisms?
Variations can help, harm and have no effect not only on individual organisms, but also on entire populations of organisms.
Charles Darwin
English naturalist. He studied the plants and animals of South America and the Pacific islands, and in his book On the Origin of Species by Means of Natural Selection (1859) set forth his theory of evolution.
Theory of Evolution
Organisms born with the best adaptations survive and pass on their traits to offspring. Organisms without these adaptations die and do not reproduce. Over time, the population changes as more organisms inherit the adaptation.
natural selection
A process in which individuals that have certain inherited traits tend to survive and reproduce at higher rates than other individuals because of those traits.
Adaptation
inherited characteristic that increases an organism's chance of survival
structural adaptation
a physical feature of an organism's body having a specific function that contributes to the survival of the organism
behavioral adaptation
an inherited behavior that helps an organism survive
Functional Adaptation
An adaptation that involves internal body systems that affect biochemistry
camouflage
an adaptation that enables a species to blend in with its environment
mimicry
The resemblance of one species to another species
What are different types of adaptations?
structural, behavioral, functional - camouflage, mimicry, and mouth shape