Upon close examination of the skeleton of an adult python, a pelvic girdle and leg bones can be observed. These features are an example of
a. artificial selection
b. homologous structures
C. vestigial structures
d. comparative embryology

During a hot day, warm and moist air rises and cools in the atmosphere. which even would occur next on such a day? a. condensed droplets would gather to become water vapor. b. water vapor would condense into tiny droplets. c. water droplets would evaporate to form rain and snow.

What is thought to have caused the mass extinction at the end of the cretaceous period?

Which layer will become saturated first when rain falls?