BIOLOGY SSS 3 FIRST TERM

WEEK NINE

THEORY OF EVOLUTION

PERFORMANCE OBJECTIVE

Students should be able to;

1. Give the theories of evolution
2. Explain the evidence of evolution

CONTENT

Charles Darwin

Charles Darwin was a British naturalist who proposed the theory of biological evolution by natural selection.

Darwin defined evolution as "descent with modification," the idea that species change over time, give rise to new species, and share a common ancestor. The mechanism that Darwin proposed for evolution is natural selection. Because resources are limited in nature, organisms with heritable traits that favour survival and reproduction will tend to leave more offspring than their peers, causing the traits to increase in frequency over generations.

Natural selection causes populations to become adapted, or increasingly well-suited, to their environments over time. Natural selection depends on the environment and requires existing heritable variation.... View More