Natural Events and the Environment Answers

Which of the following is not a possible reason for migration?

Organisms are dependent on each other for the energy they need to survive. Photos (left to right) by Mehmet Karatay, Jens Buurgaard Nielsen, Furryscaly, and Walter Siegmund What would occur if the snake population is removed from the ecosystem pictured above?

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 _______.

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. In the short term, what will happen to the other members of the food chain if the mice were removed?

What is a possible cause for a decrease in ecosystem productivity?

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. What will happen to the other members of the food chain if the grasshoppers are removed?

How can an increase in biodiversity lead to an increase in ecosystem stability?

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. What is likely to happen if a new organism that feeds off mice is introduced?

Macroevolution occurs within a population.

Consider the following food chain: Plants are eaten by grasshoppers, which are eaten by mice, which are eaten by snakes. What will happen to snakes in the long term if mice become extinct?