Topic Test Answers

Ecosystems with greater biodiversity have an increased stability.

Organisms can have positive or negative impacts on the ecosystem they live in. The cane toad, or Rhinella marina, was introduced to the Hawaiian Islands in 1932 by sugar cane farmers. Farmers released the toads in their crops to help control pests that were damaging the sugar cane. The cane toad has few natural predators, as it secretes a poisonous toxin from its skin that deters larger organisms from eating it. As a result, the cane toad population thrived and grew to number hundreds of thousands by 1935. Photo by Patrick Gijsbers Which role does the cane toad play in the Hawaiian Islands?

Which marine habitats would have the least access to primary producers?

Which of the following aquatic environments would not freeze in winter?

Bacteria living in the soil are dependent upon which of the following abiotic factors?

The variability in marine salinity between habitats does not impact the fish living there.

Which habitat would have the least variation in its salinity?

A variety of different mechanisms in nature help create diversity in organism populations. The tundra found in the northernmost parts of the planet is the world’s youngest biome. The tundra is home to a variety of plants and animals. Organisms that can be found in the tundra include shrubs, mosses, caribou, polar bears, and wolves. Which mechanism do the different organism populations found across the tundra exemplify?

Migration causes a temporary appearance of new organisms in an ecosystem, but not a permanent one. Please select the best answer from the choices provided

The competitive exclusion principle states that _______.

Which of the following is not true about Polar bears?

When the comb jelly, Mnemiopsis leidyi, was introduced into the Black Sea, its population exploded to 500 comb jellies per cubic yard in 1988. The jellies devoured all the zooplankton and fish larvae, drastically reducing the numbers of the native fish populations. This situation demonstrates _______.

Which of the following Gila Monster adaptations is based on the reproductive cycles of Gambel’s quails and cottontail rabbits?

Blizzards and hurricanes are examples of contrasting observable events.

Bruce believes that male students in his physics course spend more time working on homework than female students. His teacher and classmates are skeptical, so they asked him for proof. Which of the following would be the best way for Bruce to prove his point?