Question

1. how can predation cause cycles in population sizes?

symbiosis:

1. what are the three main types of symbiotic relationships?
2. complete the table using the information from slides #22 - 24.

parasitism herbivory mutualism commensalism
type of relationship
animal example

Explanation:

1. When predators hunt prey, the prey population decreases. With fewer prey, predators have less food, so their population also decreases. Then, with fewer predators, the prey population can recover and increase again, starting a new cycle.
2. The three main types of symbiotic relationships are mutualism (both organisms benefit), commensalism (one benefits, the other is unaffected), and parasitism (one benefits, the other is harmed).

17.

	Parasitism	Herbivory	Mutualism	Commensalism
Animal Example	Tapeworm in a human's intestine	Cow eating grass	Bees and flowers (bees get nectar, flowers get pollinated)	Barnacles on whales (barnacles get a place to live, whales are not affected)

Answer:

1. When predators hunt prey, prey population drops. With less food, predator population drops. Then, with fewer predators, prey population recovers, creating a cycle.
2. Mutualism, Commensalism, Parasitism

17.

	Parasitism	Herbivory	Mutualism	Commensalism
Animal Example	Tapeworm in a human's intestine	Cow eating grass	Bees and flowers (bees get nectar, flowers get pollinated)	Barnacles on whales (barnacles get a place to live, whales are not affected)