If you do not do this, subsequent windows displaying the answer will not be visible. Answer Key Explanations for selected questions 1. to 3. Organisms are products of a history of descent with modification. Characteristics acquired by an organism during its lifetime are inherited by its offspring. The goal of evolution is to adapt organisms to the environment.
Evolutionary change is brought about by natural selection.
Rainforests in Brazil. Fossil mammals and seashells in South America. The reptiles and birds of the Galapagos Islands. Kangaroos and other marsupials in Australia. Mutations can happen at a rate of 10 -5 .