then guess.
Because it is not expected that all test takers will complete this section, do
not spend too much time on difficult questions. First answer the questions you
can answer readily. Then, if you have time, return to the difficult questions later.
Do not get stuck on one question. Work quickly but accurately. Use your time
effectively.
Directions: For each question or statement, select the one lettered choice
that is the best answer and fill in the corresponding circle on the answer
sheet.- Which of the following would be most likely to increase competition
among the members of a squirrel population in a given area?
(A) An epidemic of rabies within the squirrel population
(B) An increase in the number of hawk predators
(C) An increase in the reproduction of squirrels
(D) An increase in temperature
(E) An increase in the food supply- Approximately how many years ago did life first appear on Earth?
(A) 1 million
(B) 500 million
(C) 1 billion
(D) 3.5 billion
(E) 5 billion- Which one of the following statements is FALSE?
(A) The greenhouse effect is a natural process that makes life on Earth
possible with 98% of total global greenhouse gas emissions being from
natural sources (mostly water vapor) and 2% from human-made
sources.
(B) The United States is the number one contributor to global warming.
(C) The Kyoto Protocol would have required the United States to increase
its greenhouse gas emissions—primarily carbon dioxide (CO 2 ),
methane (CH 4 ), and nitrous oxide (N 2 O)—by only 2% per year based
on 1990 levels.