3. In an ecosystem, different organisms interact with each other.
What evidence from the passage supports this statement?
A. Plants use sunlight, water, and carbon dioxide in a process called photosynthesis.
B. Forest ecosystems cover about a quarter, or one-fourth, of the total land surface in the
world.
C. Producers are living things that can make their own energy out of non-living
resources.
D. A deer decomposing in the soil provides food for bacteria and nutrients for plants to
grow.
4. Based on the information in the passage, what do all ecosystems have in common?
A. All ecosystems are home to living beings that interact with each other.
B. All ecosystems are home to trees, deer, humans, rodents, wolves, hawks, and
bacteria.
C. All ecosystems have an equal number of consumers, decomposers, and producers,
D. All ecosystems have a few consumers that do not interact with decomposers and
producers.

During a hot day, warm and moist air rises and cools in the atmosphere. which even would occur next on such a day? a. condensed droplets would gather to become water vapor. b. water vapor would condense into tiny droplets. c. water droplets would evaporate to form rain and snow.

Read the following scenario to answer the following question. over the past 60 years, many amphibian species have experienced significant population declines, and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Which of the following is a common danger of commercial fishing?