Which one of the following statements is true ? Muluple Choice Organisms always evolve the characteristics they need to survive

Some individuals within the population must die for natural selection to occur

Darwin used molecular biology as evidence of evolution

Natural selection can only work on varation that already exists.

Convergent evoluton produces homologous structures .

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1. is geographic distribution

2 is increasing complexity

3 is transitional forms

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.