Life Science Chapter 8

Test Description: History of Life on Earth

Instructions: Answer all questions to get your test result.

1) What percentage of the original substances will be present after two half-lives have occurred?

2) Plate tectonics is the theory of how huge pieces of crust, tectonic plates, move around the globe.

3) 245 million years ago, the continents were one giant landmass called _________.

4) The atmosphere has always been composed of oxygen.

5) The ozone is important because it ________________________.

6) Where did life originate?

7) The group of mammals including apes, monkeys, humans, and prosimians.

8) Humans and human-like ancestors are called ___________.

9) Scientists think the first cells were anaerobic because there was no oxygen available when they developed.

10) The first primate ancestors, called hominids, appeared during the Cenozoic era.

11) Why are there usually more fossils from the Cenozoic era than from any other geologic era.

12) Which of the following is not an evolutionary change in early hominids that lead to the rise of modern humans?

13) These hominids made sophisticated tools, hunted large animals, wore clothing, and cared for the sick and elderly. Their extinction is a mystery.

14) What is one important biological event that occurred during the Precambrian time?


*select an answer for all questions

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