Fossilized foot bones show that some hominids living between 3 and 3.5 mya walked upright but had partially opposable big toes. This suggests that a. the shift to bipedalism was not sudden and complete, and the earliest bipedal hominins may have also spent some time in the trees for shelter or to find food. b. the shift from quadrupedalism to bipedalism happened abruptly about 2.5 mya when hominins could no longer find any food in trees. c. hominins actually shifted from bipedalism to quadrupedalism, as it proved to be an advantage when acquiring food. d. having a partially opposable big toe helped bipedal hominins run faster to avoid their predators.

Which of the following terms describes all organisms on Earth plus their environments? a. biosphere c. habitat b. ecosystem d. species

Determine which examples are density-dependent population changes and which are density-independent population changes. a. density-dependent population change b. density-independent population change

The biosphere is defined as all the living organisms on Earth along with the all of the matter in which they live.

The widespread, long-term pattern of weather in a region is called weather.

The term “biotic” includes a. all living organisms. b. all nonliving components of the biosphere. c. both living and nonliving components of the biosphere. d. only those living and nonliving factors that interact with each other.

There were 5.2 people per acre in 2012. A census in 2017 found there were 1.2 people per acre. This change represents a(n) ________ in population ________. a. decrease; size c. increase; size b. decrease; density d. increase; density

Genetic modification of mosquitoes is designed to increase the population of mosquitoes.

It has been reported that 55% of people in the United States use prescription eyewear. You select at random 25 unrelated US people and ask each if he or she used prescription eyewear.  Find the expected number of US people that will use prescription eyewear.

In a study it was found that 46% of people enjoy their jobs, 15% of people enjoy their personal lives, and 8% of people enjoy their jobs and enjoy their personal lives. Given the events: Job = “selected person enjoys the job” Life= “selected person enjoys the personal life” Classify these two events as: