What would best explain the decrease in primary producers?

• an increase in solar energy
• a decrease in O2 levels in the H2O
• a decrease in the population of tertiary consumers
• an increase in the population of primary consumers

How will humans be affected if phytoplankton goes extinct?

• There will be more oxygen.
• There will be the same amount oxygen
• There will be more carbon dioxide
• There will be less carbon dioxide

Which organisms compete for the same food?

• Rabbits and mice
• Rabbits and foxes
• Mice and grasshoppers
• Grasshoppers and owls

Which is an example of biotic and abiotic factors interacting together in an ecosystem?

• Bear eating a fish
• Rabbit eating grass
• A dog digging in the dirt

What is natural selection?

• Survival of the fittest.
• Everyone survives.
• Only I survive.
• Nobody survives.

Why do birds have different beak shapes?

• They eat different things.
• They sing songs differently
• They build different types of nests
• They must protect themselves differently.

Which of the following would best be identified as a predator/prey relationship?

• Dog --> Dragonfly
• Grass --> Cow
• Mouse --> Hawk
• Chipmonk --> grass

What does every food chain start with?

• producers
• sun
• consumer
• decomposers

An organism that needs to eat other organisms to obtain energy is known as a:

• Autotroph
• Producer
• Consumer
• Mutualist

Energy increases as you move up the food chain pyramid (from producer up through tertiary consumer).

• True 
• False