Two species of animal are found in the same area of forest and grassland. In the spring and summer they eat the same plant food. However, in the autumn and winter one eats nuts in the forest and the other eats roots on the grassland. Both species are preyed upon by the same predator. Numbers of root-eating animals are reduced most by this, but they recover faster since they reproduce faster. What can be concluded about these two species of animals? 1 They are part of the same community. 2 They are at different trophic levels. 3 They occupy different habitats. 4 They have different niches.

Which statements about energy flow in ecosystems are correct? 1 All energy eventually leaves ecosystems in the form o…

In many freshwater ecosystems, the availability of inorganic nitrogen compounds is a limiting factor for growth. This…

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Red blood cells were placed in a solution of sodium chloride with a less negative water potential than the cell conte…

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Which statements about a diploid cell are correct? 1 can divide by mitosis to repair itself 2 possesses two complete…