Base your answer to the following question on the diagram of a food web.

Which organisms are not shown in the diagram but are essential to a balanced ecosystem?

Base your answer to the following question on the diagram of a food web.

Which organisms are primary consumers?

One arctic food chain consists of polar bears, fish, seaweed, and seals. Which sequence demonstrates the correct flow of energy between these organisms?

Base your answer to the following question on the diagram below that represents an energy pyramid in a meadow ecosystem.

Which species would have the largest amount of available energy in this ecosystem?

Base your answer to the following question on the diagram below that represents an energy pyramid in a meadow ecosystem.

Which two organisms are carnivores?

The diagram below represents a food web.

Two of the herbivores represented in this food web are

Base your answer to the following question on the diagram below.

What is an appropriate title for this diagram?

Which statement best describes the fruit fly population in the part of the curve labeled X in the graph?

Base your answer to the following question on the energy pyramid.

The greatest amount of available energy is transferred from level

Base your answer to the following question on the diagram of a food web.

What do the arrows in the diagram represent?

Base your answer to the following question on the diagram of a food web.

Which statement correctly describes interactions between organisms in this ecosystem?

Base your answer to the following question on the diagram, which shows an energy pyramid for an ecosystem in the Australian outback.

Which two organisms could have a predator-prey relationship?

Base your answer to the following question on the diagram, which shows an energy pyramid for an ecosystem in the Australian outback.

Wombats are classified as herbivores because they can

Base your answer to the following question on the food web and graph below. The graph represents the interaction of two different populations, A and B, in the food web.

Population A is made up of living animals. The members of population B feed on these living animals. The members of population B are most likely

Base your answer to the following question on the table, which shows the type of food consumed by various animals in a community.

Which animals in the community would be classified as herbivores?

Base your answer to the following question on the diagram of an energy pyramid.

Which term best describes the mosquito larvae?

An owl cannot entirely digest the animal it eats. Therefore, each day it produces and regurgitates a pellet composed of materials such as fur, bones and cartilage. By examining owl pellets, ecologists are able to determine the

Which relationship best describes the interactions between lettuce and a rabbit?

A food web is more stable than a food chain because a food web

Base your answer to the following question on the diagram of an ecosystem below.

The base of an energy pyramid for this ecosystem would include

Base your answer to the following question on the food web.

Which organisms are carnivores?

In a forest community, a shelf fungus and a slug live on the side of a decaying tree trunk. The fungus digests and absorbs materials from the tree, while the slug eats algae growing on the outside of the trunk. These organisms do not compete with one another because they occupy

Base your answer to the following question on the graph, which shows the growth of a population of rabbits in a specific ecosystem.

Which environmental factor could have caused the change indicated at A?

What impact do the amounts of available energy, water, and oxygen have on an ecosystem?

The diagram represents many species of plants and animals and their surroundings. The diagram best represents

Puppies are often given medicine to eliminate roundworms from their intestines. These worms consume some of the food the puppies have digested. The worms and the puppies represent a relationship known as

Deer ticks are responsible for spreading Lyme disease. This organism, which feeds on the blood of warm-blooded animals like mice, deer, and humans, is best described as a

The study of the interrelationships of plants and animals and their interaction with the physical environment is known as

Crows frequently are observed feeding on dead animals they have not killed. On this basis, the crow is classified as a

A characteristic shared by both predators and parasites is that they both

Two different species with the same niche are placed in the same habitat. These two species will most likely

In the following food chain, which organisms are the primary consumers?

weeds --> grasshoppers --> praying mantises --> shrews --

> barn owls

In this food chain, which population normal would have the smallest number of individuals?

grass --> grasshopper --> frog --> snake --> hawk

The most likely result of a group of squirrels relying on limited resources would be

Which pair of organisms represents a predator-prey relationship?

The wrasse, a small fish, occasionally cleans harmful parasites from the mouth and body of the moray eel. The moral eel, in turn, protects the wrasse from larger predators and provides it with a constant supply of food. This is an example of the type of relationship known as

The acacia tree is protected from other insects by a certain species of ant. The ants, in turn, feed on a sweet secretion by the tree. This type of nutritional relationship is known as

Crocodiles often allow ibises (small birds) to enter their mouths to pick bits of food from between their teeth. Both the crocodiles and the ibises benefit. This symbiotic relationship is known as

Select the type of symbiosis that best identifies the relationship of a flea that sucks blood from the skin of a dog.

Base your answer to the following question on the key.

Which set of symbols indicates a relationship that is least likely to exist in nature?

All the cottontail rabbits in a country would represent

In an ecosystem, the ultimate source of all energy is

A sudden increase in the number of producers in an ecosystem would first affect the population of

The wolves, elk, bears, beavers, willow trees, and aspen trees in Yellowstone National Park together make up part of a

The graph shows the changes in the size of a fish population over a period of time. The dashed line on the graph represents the

Black rat snakes can produce a foul-smelling musk that they can spread using their tails. Which stimulus most likely causes this behavior?

The image shows a male peacock spider lifting two of its legs and its colorful tail flap up in the air. Why does a male peacock spider display this kind of behavior?