Bird & Tree: A bird builds a nest in a hole in the trunk of the tree. It is protected from the rain and predators. The tree is not harmed or helped by the bird.

What type of ecological relationship?  Hummingbirds feed on nectar from flowers.  The flowers are pollinated by hummingbirds as they move from flower to flower.

Rabbits and deer both eat lettuce leaves from a garden.
^{What ecological interaction describes the relationship between rabbits and deer?}

What level of ecological organization would include all squirrels that live in the same area?

Food webs are models that show

Organisms that make their own food by using sunlight or chemical energy to convert simple inorganic molecules into complex, energy-rich organic molecules like glucose are called

An organism that must obtain their nutrients by eating other organisms is called a

Heterotrophs that get energy and nutrition from dead or decaying organisms or their waste products and recycle nutrients back to the ecosystem.

Where does the energy start in this food chain?

The arrows in a food chain or web represents what?

An energy pyramid represents what?

According to the food web, the birds receive energy from which organisms?

What would happen to the blue whale population if the krill population went extinct?

What process occurs when tiny water droplets move closer and cling together in the atmosphere?

Which of the following is NOT a way water moves from the land to the air?

What is it called when plants release water vapor through their leaves and into the atmosphere?

An ocean bay food web is pictured.

Imagine a sea otter moves to the area. The sea otter eats crabs. What would happen to the ecosystem?

What point on the graph represents the carrying capacity?

Two male Giraffes are fighting over the last green leaf of a tree that is dying.

What is an example of a density-independent limiting factor?

parasites, disease, predators, are examples of what type of limiting factors?

The brown tree snake was accidentally introduced to the island of Guam during World War II. Since then, this snake has caused the extinction of twelve native bird species by eating their eggs and young. One negative result of this snake's introduction was most likely

This may cause a population to increase

What is the carrying capacity of the graph?

The graph to the right shows the interaction of the wolf and moose populations on Isle Pekie. If the moose population continues to increase, the wolves' food supply will increase. What will most likely happen to the wolf population as a result?

A scientist was studying a population of fish in a pond over a period of 10 years. He observed that

the population increased each year for 3 years, and then remained nearly constant for the rest of

the study. The best explanation for this observation is that the population had

What are factors that affect carrying capacity?

What happens if a population grows past its carrying capacity?

Why do scientists use sampling techniques to gather population data?

Conservationists want to find the population of a species of mountain goat. On one day they capture 12 goats, tag them and release. A week later they capture 8 goats, 5 of which are tagged. What would the estimate of the population be?

Rain and snow are two different forms of precipitation that fall on Earth's surface. Which factor is responsible for there being different forms of precipitation?

What is the main way carbon is removed from the atmosphere?