HOL 4

Question 1

Mesozoic era

Answer 1

The Mesozoic Era (251.9 to 66.0 million years ago) was the “Age of Reptiles.”

Question 2

angiosperms

Answer 2

Angiosperms are plants that produce flowers and bear their seeds in fruits. Any of about 300,000 species of flowering plants, the largest and most diverse group within the kingdom Plantae

Question 3

Mammals were distinguished by the following characteristics

Answer 3

Hair which provided insulation
Mammary glands which provided nourishing milk to their young
A uterus which made live birth possible

Question 4

Mass extinction occurs when

Answer 4

large numbers of species disappear within a relatively short time

Question 5

There appear to be two major causes of mass extinctions what are they

Answer 5

Super volcanoes and Tectonic plate boundaries

Question 6

What caused Permian extinction

Answer 6

Warming of the Earth’s climate and associated changes to oceans were the most likely causes of the extinctions.