Some organisms seem to have undergone very rapid evolutionary change
over relatively short spans of geologic time. One example is the sudden
rise of mammals after the extinction of the dinosaurs. Mammals first
appear in the fossil record during the Triassic period. Dinosaurs also
appear int he fossil record from that time period. Early mammals were
very small and had characteristics similar to those of marsupials and
monotremes, such as the spiny echidna. During the Cretaceous extinction
of the dinosaurs, mammals suddenly diversified into many new forms.
They have since become a dominant life form on Earth. Why do you think
the mammals evolved so rapidly?
4 sentence
ASAP
What is one way in which Darwinian evolutionary theory is different from neo-Darwinian evolutionary theory? Explain.
3 sentence
ASAP
15 points
