The diagram below shows mushrooms, a type of decomposer, growing on a rotting log. Why are the mushrooms using the log?

• The mushrooms use the log as a source of oxygen.
• The mushrooms use the log as a food source.

Which statement best describes what would happen if a disease enters this environment and reduces the population of mice ?

• The cricket population will increase.
• The snake population will increase.

Which statement concerning the energy in this pyramid is correct?

• Stored energy decreases from consumer 2 to consumer 3.
• Consumer 3 contains the greatest amount of stored energy.

Why are decomposers important to the food chain?

• They provide nutrients for the growth of plants.
• They are pets to humans.

Which organisms would most likely have a predator-prey relationship?

• barnacle and whale
• hawk and mouse

• A
• B
• D

What is the name for chemical changes in your body?

• inheritance
• metabolism

How does your body removes harmful substances?

• secretion
• pinocytosis
• excretion

Which example is an autotroph (makes its own food)?

• A mushroom decomposes a dead log.
• A tree makes food during photosynthesis.

What group is “Drosophila” in the name Drosophila melanogaster?

• genus
• species