How extensive are the effects of human activities on the planet?
a. Humans have indirectly affected about 75% of the earth's land surface.
b. Humans have caused great harm in the world's oceans, but not so much on land surfaces.
c. Humans have directly affected about 75% of the earth's land surface.
d. Humans have directly affected about 83% of the earth's land surface, including Greenland and Antarctica.
e. Humans have directly affected about 83% of the earth's land surface, excluding Greenland and Antarctica
E
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You travel to Costa Rica during the winter holidays for an eco-tour vacation. Part of your tour includes a visit to a beach late at night to observe endangered turtles laying their eggs on the beach
When you arrive at the appointed place and hour, you are startled to see an armed guard at the entrance to the beach. You learn that the armed guard is there to assure that no one enters the turtle egg-laying area too early, or in too large a group, as these actions would prevent the turtles from laying their eggs. This is an example of a. a militant environmental group b. an Endangered Species Act misinterpreted c. environmental security d. eco-terrorism e. both a militant environmental group and environmental security
Wave-formed ripple marks ____
A)tend to have symmetrical profiles B)are good indicators of ancient current directions C)have a gentle slope and a steep slope D)form in undisturbed deep-sea sedimentary environments E)form when clay-rich sediment dries and shrinks
Microclimate refers to the ____
A) climate of a valley or forest B) climatic conditions inside a house or building C) climatic changes that occur over a short period of time D) small climatic region near the ground
Which of the following best matches the description?Initial phase of population growth during which growth occurs very slowly.
A. population density B. density-independent factor C. age distribution D. immigration E. dispersal F. carrying capacity G. exponential growth phase H. biotic potential I. stable equilibrium phase J. environmental resistance K. emigration L. death phase M. density-dependent limiting factor N. r-strategist O. K-strategist P. lag phase