What is the species eaten in a predation called?

Which type of relationship helps regulate the population?

Ostriches and gazelles feed next to each other and watch for predators, alerting each other to danger. Since the visual abilities of the two species are different, they each can identify threats the other animal would not as readily see. This is an example of -

Oxpeckers are a type of small bird that land on zebras and eat ticks and other parasites that live on the zebra’s skin. The oxpeckers get food and the zebras get pests removed. This is an example of -

Ticks live on dogs and feed off the dog’s blood. They may also infect the dog with a parasite that can cause the dog to become quite sick. Dogs also are sometimes found to be very tired because a large volume of their blood has been drained. This is an example of -

Wrasse fish feed on the parasites found on the black sea bass's body (usually in the mouth). This is like dental floss for the fish and both species benefit. This is an example of which type of symbiosis?

What may happen if the grasshoppers were removed from the food web pictured?

Mistletoe extracts water and nutrients from the spruce tree to the detriment (ill effect) of the spruce. This is an example of which type of symbiosis?

Based on the graph, what happens to the amount of kelp as sea otter numbers decrease?

What is a keystone species?

The purple sea star (Pisaster ochraceus) supports biodiversity in tidepools and is therefore a(n)...