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Which organisms and set of characteristics are correctly paired?*
Humans have an effect on ecosystems when they use native grasslands or forested areas for farming or urban use. One negative effect of these changes on the ecosystem is that there will be*
The diagram below represents structures found in the female reproductive system.
If the areas labeled A were completely blocked on both sides, the most likely result would be that*
Scientists have studied oceanic plastic garbage “patches” around the world. These are areas that accumulate plastic garbage from coastal regions. Their environmental effect ranges from killing sea life to blocking sunlight from reaching photosynthetic organisms. Without a change in human plastic usage, new garbage patches will continue to form. Which human activity would most directly reduce the amount of plastic garbage that enters the ocean?*
Monarch butterflies migrate from the U.S. and Canada to Mexico every winter. Over the past 10 years, there has been a drastic decrease in the number of monarch butterflies. Scientists have estimated that the population may have decreased from about 1 billion to 35 million. Which action would not be considered a reason for the decline in monarch butterfly populations?*
Finches on the Galapagos Islands express a variety of traits. Variability in the offspring of these finches is a result of*
Exposure to certain environmental toxins, such as pesticides, may reduce fertility in males by interfering with their ability to produce gametes. These toxins are most likely having an effect on the*
Which statement best describes an important process carried out by structure X?
Traditional lightbulbs are only 10% efficient. Ninety percent of the energy they use is converted to heat. Modern lightbulbs are much more efficient, but may cost three times as much as traditional lightbulbs. Consumers who switch to modern lightbulbs are most likely*
Many oak trees are cut down and removed from an oak-hickory forest. A likely result of the direct harvesting of the oak species would be the*
A sequence of events is represented in the diagram below.
Which statement best describes a result of this process?*
Which change is an example of a response to a stimulus?*
After feeding at the surface of the ocean during the day, many ocean organisms migrate to deeper waters. While there, they release ammonia in their urine. Many bacteria use the nitrogen from the ammonia as they make amino acids, which eventually end up in food chains on both land and water. These amino acids may even be used in humans. Which statement best explains these observations?*
Which statement describes an event that would most severely disrupt the process of ecological succession in an area?*
The processes of diffusion and active transport are both used to*