Life Science Chapter 8: Question Preview (ID: 23906)

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What is one important biological event that occurred during the Precambrian time?
a) life began
b) multicellular organisms appeared
c) reptiles appeared
d) large mammals appeared

These hominids made sophisticated tools, hunted large animals, wore clothing, and cared for the sick and elderly. Their extinction is a mystery.
a) australopithecines
b) hominids in the genus Homo
c) Neanderthals
d) Cro-Magnons

Which of the following is not an evolutionary change in early hominids that lead to the rise of modern humans?
a) longer legs
b) bigger brains
c) shorter arms
d) bipedalism

The first primate ancestors, called hominids, appeared during the Cenozoic era.
a) True
b) False

Why are there usually more fossils from the Cenozoic era than from any other geologic era.
a) There is more life
b) The Cenozoic era is the oldest era, so the fossils are found closer to the surface.
c) The Cenozoic era is the present era, so the fossils are easier to find because they are closer to the surface.

Scientists think the first cells were anaerobic because there was no oxygen available when they developed.
a) True
b) False

Humans and human-like ancestors are called ___________.
a) primates
b) hominids
c) promisians
d) australopithecines

Where did life originate?
a) land
b) oceans
c) air
d) magma

The group of mammals including apes, monkeys, humans, and prosimians.
a) hominids
b) primates
c) australopithecines
d) homo habilias

The atmosphere has always been composed of oxygen.
a) True
b) False

The ozone is important because it ________________________.
a) It blocks UV radiation from the sun.
b) It uses up breathable oxygen.
c) You can breathe it in.

245 million years ago, the continents were one giant landmass called _________.
a) Pangea
b) Gondawandaland
c) Laurasia

What percentage of the original substances will be present after two half-lives have occurred?
a) 50%
b) 75%
c) 25%
d) 0%

Plate tectonics is the theory of how huge pieces of crust, tectonic plates, move around the globe.
a) True
b) False

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