How did dobzhansky and mayr explain the origin of species?

it happens through adaptation by natural selection.
it happens through sympatric speciation.
it happens through allopatric speciation.

Compare the composition of the moon's surface with the composition of the earth's surface.

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird