Biology Topic Practice
How Natural Selection Works
Charles Darwin's theory of natural selection explains how entire populations adapt and change over millions of years.
Why must individuals compete for survival in an ecosystem?
What is How Natural Selection Works?
"Evolution by natural selection is the process by which populations of living organisms change and adapt."
Question 1
What is evolution?
Question 2
Which statement best describes natural selection?
Question 3
What is speciation?
Step-by-Step Evolution
Mutation leads to variation in a population.
Individuals with advantageous traits are more likely to survive (Survival of the Fittest).
These survivors breed and pass on the useful alleles to their offspring.
Exam Tip
Evolution is a very slow process that takes place over many generations.
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