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The energy content and biomass of ________ are lowest in a terrestrial food web.

Use the accompanying figure to answer the following questions.Which of the following organisms in the figure is depicted as being at the highest trophic level?

Why do ecologists favor the term food web as opposed to food chain?

Read the following scenario and answer the questions below. (Same prompt as before)In the early 20th century there were lush stands of tall grasses in the valleys of Arizona. Dramatic summer rainstorms dumped huge amounts of water, very quickly, on the rocky upper slopes. The water ran down the slopes and into the grasslands, where it quickly soaked into the soft, porous soil where prairie dogs were active. Cattle-ranching utilized the grasses, but the ranchers did not appreciate the multitudes of prairie dogs that lived in the grasslands. Prairie dogs constantly dug through the soil, making new burrows and eating grasses, roots and all. It was commonly believed that cattle and horses would stumble in the prairie dog holes and break their legs. In addition, many ranchers were convinced that the prairie dogs would destroy the grasses because they directly competed with the cattle for food. The ranchers had already done away with most predators that preyed on prairie dogs and might possibly affect cattle and now they turned their attention to the prairie dogs themselves. The ranchers became a part of a new federally sponsored movement to poison the grassland prairie dogs. This movement took root and spread through the 1920s and 1930s.One direct result of removing the predators of prairie dogs may have been:

Which of the following statements accurately represents the concept of evolution?

Human activity has affected every aspect of the water cycle. Identify three ways that humans have altered the water cycle. What are the major concerns regarding our alteration of the water cycle?

In an ecosystem with many similar species, we typically find

A significant pathway for carbon shifting from the crust and mantle of the Earth to the atmosphere is ________.

Dynamic equilibrium is when ________.

It is inaccurate to say “natural selection changes individuals'”. Which of the following statements provides the most accurate explanation for this inaccuracy?