A food web diagram is provided. Which of the following organisms depend only on producers for energy?
The energy organisms need to live and grow first enters the ecosystem when -
Matter is passed from living part of an ecosystem to the non-living part when which of the following takes place?
A food web diagram is provided. Bases on the diagram, it is reasonable to conclude that matter could follow which of the following paths as it cycles through this ecosystem?
Which of the following observations would support the claim that as plants absorb sunlight to make food, they release oxygen into the environment?
The graph below shows populations, over several years, for two animals that share a habitat. Foxes are mammals that hunt for food, and grouse are birds, a common prey animal of foxes. According to the data, in which year did the population of foxes show a decrease that is most likely the result of a decrease in the availability of a source of food?
An increase in the population of an organism would most likely be associated with which of the following?
The milkweed plants serves an important role in the life cycle of the monarch butterfly. Adult butterflies lay their eggs in the milkweed, and then caterpillars eat the same plant during their development. Based on the relationship between the monarchs and milkweed, which of the following trend would be predicted when looking at the data on the population of these two organisms.
Eagles and grizzly bears live together in the same habitat. There will be competition between the eagles and the grizzly bears only if which of the following is true?
An increase in which of the following factors is likely to contribute to competition between two members of the same species living in a certain habitat?
The population of deer in a certain area is monitored over a period of six years. The data is represented in the graph provided. Which of the following is the most likely explanation for the change in population in 2009?
A student wants to investigate competition between two organisms. FOr the investigation, it is most important that the student should choose organisms that .....
These graphs show how two factors for a certain region changed over time: the number of predators that prey on mice and number of plants of the type that the mice eat. Based on the information from these graphs, in which of the following years would the population of mice have been the highest?
The table provides information on population density of mayflies, a kind of insect, in a certain area over a few years. Based on the population density data provided, which data provides evidence that there was a significant increase in the population of birds that prey on mayflies.
An example of a predator and a prey species for four separate ecosystems is provided below. Which of the following would demonstrate and appropriate prediction for the changes to one of the populations of organisms due to a predator/prey interaction?
Which of the following describes a symbiotic relationship?
information on brown tree snakes is provided along with information on the island of Guam. Brown tree snakes were first brought to Guam in 1059. Which of the following would provide evidence that the change to this environment brought about by the introduction of the brown tree snake has had an effect of the populations of organisms that lived on Guam?
A physical disruption to an ecosystem occurs when a highway was built through a forest. Which of the following would provide evidence that the addition of a highway to this forest affected populations?
The ecosystem with the greatest biodiversity is the one that has the greatest:
Changes to an ecosystem's biodiversity can have a direct effect on humans because humans -