Natural Events and the Environment Answers

Which of the following is not a possible reason for migration?a.climate changesb.diminished food supplyc.reproduction patternsd.increased biodiversity

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 _______.a.the difference between biotic and abiotic factors in an ecosystem.b.effects of local evolution or migration on an ecosystem.c.the impact of removing or adding organisms to an ecosystem.d.the types of interactions between organisms in an ecosystem.

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? a. the number of plants will decrease, the number of grasshoppers will increase, the number of snakes will decrease b. the number of plants will decrease, the number of grasshoppers will decrease, the number of snakes will decrease c. the number of plants will increase, the number of grasshoppers will increase, the number of snakes will decrease d. the number of plants will increase, the number of grasshoppers will increase, the number of snakes will increase Please select the best answer from the choices provided

What is a possible cause for a decrease in ecosystem productivity?a.an increase in the biodiversity of the ecosystemb.a decrease of the biodiversity of an ecosystemc.the biodiversity of an ecosystem experiencing no changed.an ecosystem becoming more stable

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? a. the number of plants will increase, the number of mice will decrease, the number of snakes will decrease b. the number of plants will decrease, the number of mice will increase, the number of snakes will increase c. the number of plants will decrease, the number of mice will increase, the number of snakes will decrease d. the number of plants will increase, the number of mice will increase, the number of snakes will increase Please select the best answer from the choices provided

How can an increase in biodiversity lead to an increase in ecosystem stability?a.A more biodiverse ecosystem is not subject to change.b.A more biodiverse ecosystem has a higher chance of adapting to species changes.c.A more biodiverse ecosystem has fewer species types to balance.d.A more biodiverse ecosystem is subject to fewer natural disasters.

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? a. The mice population will increase in response to the arrival of the new organism. b. The mice population, grasshopper population, and plant population will all increase. c. The new organism will compete with the snake population for resources. d. The populations of the existing organisms will remain unaffected. Please select the best answer from the choices provided

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? a. The number of snakes will increase temporarily, and then decrease. b. The number of snakes will decrease permanently, but they will not die out completely. c. The number of snakes will decrease temporarily and then increase. d. Snakes will die out if they do not find an alternative food source. Please select the best answer from the choices provided