environmental changes

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

If additional snakes are introduced into this ecosystem, there will most likely be an immediate decrease in the _________.  

• hawk population
• rabbit population
• wildflower population
• grass population

If a prey population rises, how will the predator population be affected?

• The predator population will remain stabe.

• The predator population will rise with it.

• The predator population will fall.

• The predator population will fluctuate randomly.

Has an immediate impact!

• Short Term
• Long Term

Three-toed tree sloths are mammals which live in the jungle trees of Central and South America. The majority of a sloth’s diet consists of leaves and buds from trees. As rainforest habitats are being destroyed, how will these organisms most likely be affected?

• Most sloths will become carnivores.

• The sloth population will likely decrease.

• Some sloths will start to hibernate.

• A cave-dwelling population will appear.

The Dead Sea has a salt concentration of 33which makes it inhospitable for aquatic plants and animals. During rainy seasons, the concentration of salt decreases and some kinds of algae begin to grow. What changes could be expected when the salt concentration returns to normal?

• Increased algae growth

• Plant life flourishes

• Algae dies off

• Animals return to the area

Some individuals of the species, Crocodylus niloticus, the Nile Crocodile, have been found living in caves deep underground. The cave dwelling population of crocodiles is thriving, while their counterparts living outside the caves have been almost completely eliminated. Which of the following changes most likely led to these crocodiles relocating to a new habitat?

• Temperatures have steadily increased over time.

• The food sources of these animals are more scarce.

• Expansion of the habitat has led to less competition.

• Annual rainfall levels have changed greatly.

Cattle egrets foraging in fields among cattle. The egret gets easy access to food and the cattle don't care if they are there or not.

• mutualism
• commensalism
• competition
• parasitism

Remoras are small fish that swim close to or attach themselves to sharks.  Remoras eat small scraps left as the sharks feed and the sharks are unaffected. 

• Competition
• Predation
• Mutualism
• Commensalism

A tapeworm and a dog have this type of relationship.

• mutualism
• parasitism
• commensalism
• competition