Why is carbon dioxide important for plants?

• Carbon dioxide gives plants their green color.

• Plants can release carbon dioxide into the air.

• Plants use carbon dioxide to make their own food.

• Carbon dioxide lets plants absorb their roots.

What is the first element of the food web?

• Eagle

• Sun

• Water

• Wolf

Every ecosystem supplies the basic needs for the organisms that live there. What are the basic needs of all organisms?

• Air, water, food, habitat

• Food, water, habitat, space

• Air, water, food, protection

• Food, attention, change, water

During which stage of complete metamorphosis does an insect change itself completely from a larva to an adult?

• Egg stage

• Larva stage

• Nymph stage

• Pupa stage

Which organism in a food web is a producer?

• Aphid

• Beetle

• Rosebush

• Spider

Ecosystem change for many different reasons. Which of the following is a natural cause of changes in an ecosystem?

• Farming

• Housebuilding

• Hurricanes

• Pollution

Saguro Cacti live in parts of California, Arizona and Mexico. Gila woodpeckers build their nests inside saguro cacti. The saguro cacti and the gila woodpeckers are both part of the same:

• atmosphere

• ecosystem

• food web

• species

Which organisms release oxygen into the air as part of the carbon dioxide - oxygen cycle?

• Consumers

• Decomposers

• Predators

• Producers

Plants in a food web are:

• consumers

• decomposers

• producers

• suppliers

Which of the following statements is correct?

• Every organism in an ecosystem eats plants to get energy.

• Predators in an ecosystem get their energy directly from plants.

• All organisms in an ecosystem get their energy from both living and non-living things.

• Every animal in an ecosystem gets its energy from another organism in the ecosystem.