1. In science class, Eric learns about relationships between organisms in nature. The concepts of predation and parasitism tend to confuse him. Which explains the difference between these two concepts? 1Parasitism results in two organisms benefiting while in predation only one organism benefits.
2Parasitism happens quickly, but predation happens over time.
3Predation results in the death of one organism while in parasitism the host may only be harmed.
4 Predation and parasitism are the same thing, since only one organism is harmed in each relationship.

2. Ryan lives in a house near a small lake. In the past few months, he has noticed that there has been very little rainfall due to a drought. He monitored the water depth in the lake by inserting a metal cylinder in the sand and marking the water level each week for 4 weeks. He recorded his data in the table below. What would MOST LIKELY take place in the lake ecosystem based on this data? *

1The fish population would decrease due to competition for food and shelter
2The deer population would increase due to increased space for habitats
3Trees near the water’s edge will grow twice as fast during the drought
4Fish-eating birds would find it more difficult to catch their prey in the lake

Sharks are the top predator in a marine ecosystem. By consuming smaller organisms, sharks maintain a balance in the population. If the shark population were to decrease, the smaller organisms would increase, interrupting the food web. Which of the following relationships is MOST similar to the relationship described? *

1A frog eats flies and lizards in a swamp ecosystem
2Leaf-cutter ants eat grass in a prairie ecosystem
3A wolf eats small mammals in a forest ecosystem
4An owl eats mice and insects in a forest ecosystem
(the picture is at the bottom of the question)