Exam 19: Earths Evolution Through Geologic Time

Extensive deposits of _________ore are found worldwide in Precambrian rocks.

The beginning of the_________ era is marked by the appearance of the first life forms with hard parts.

Which type of bacteria thrives in environments that lack free oxygen?

The sun in the making is known as the __________.

The most economically important resource in Cenozoic strata of the Gulf Coast is_________ .

Following the reptilian extinctions at the close of the Mesozoic, two groups of mammals, the marsupials and_________ , diversified.

Compare and contrast the patterns of life in the Paleozoic Era to the Mesozoic Era. What are the major differences between these two eras? Are there similarities or similar trends?

By the late _________Period, true air- breathing amphibians with fish- like heads and tails had evolved.