The mesozoic era was the "age of reptiles." at the end of the mesozoic era, many groups of animals disappeared suddenly. scientific evidence suggests that which of the following occurred at that time?

a. the earth stopped rotating for a brief time.
b. the animals began living underground.
c. the animals were hunted to extinction by humans.
d. a large asteroid or comet impacted the earth.

How does human environment effect the biosphere

Amniocentesis is a process in which amniotic fluid is taken from the mother's womb to identify any genetic abnormalities in the fetus. how would the discovery of the human genome contribute to this process?

Which of the following matches the organisms described with the correct domain? a. archaea--multicellular, eukaryotic organisms that do not have cell walls b. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sources c. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycan d. bacteria--unicellular, eukaryotic organisms that always lack cell walls