What does the base of the food chain provide food for?
Options:
- (A) It helps them survive
- (B) sediments
- (C) Most plants
- (D) other organisms
- (E) our planet
- (F) energy systems
- (G) fruits
- (H) Animal survival
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Let's think first: Producers are organisms that produce food for themselves and other organisms. Producers are the base of the food chain. The base of the food chain help provide food for other organisms.... So the answer is [(D)]

Phytoplankton have a clever way of making food from what?
Options:
- (A) sunlight energy
- (B) water energy
- (C) heat energy
- (D) heat produced
- (E) chemical energy
- (F) mechanical energy
- (G) organic matter
- (H) refraction of light
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Let's think first: Phytoplankton are bacteria and algae that use sunlight to make food. Plants have a very clever way of using the energy from sunlight to make their food. Phytoplankton have a clever way of making food from sunlight energy.... So the answer is [(A)]

Courtship is a behavior that animals use to attract what?
Options:
- (A) a pollinator
- (B) a partner
- (C) animals
- (D) a child
- (E) honeybees
- (F) humans
- (G) reproduce
- (H) a host
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Let's think first: Courtship is behavior that is intended to attract a mate. Mating Ducks usually look for a mate or partner in winter. Courtship is behavior that is intended to attract a partner.... So the answer is [(B)]

What is an example of an echinoderm?
Options:
- (A) a fish
- (B) eel
- (C) starfish
- (D) parasites
- (E) ferns
- (F) shark
- (G) fertile
- (H) algae
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Let's think first: Echinoderms have a unique water vascular system with tube feet. Each starfish arm is lined with tube feet. Starfish are an echinoderm with a unique water vascular system.... So the answer is [(C)]

What are attached permanently?
Options:
- (A) Veins and arteries.
- (B) sensory neurons
- (C) barnacles
- (D) tadpoles
- (E) seahorses
- (F) alligators
- (G) adult sponges
- (H) an organism's body
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Let's think first: Adult sponges are sessile. Sessile Attached permanently, immobile. Adult sponges are attached permanently and cannot move.... So the answer is [(G)]

What is able to make food using inorganic molecules?
Options:
- (A) trees
- (B) potatoes
- (C) ozone
- (D) organic fertilizer
- (E) bacteria
- (F) a plant
- (G) a consumer
- (H) fungi
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Let's think first: Producers make food from inorganic molecules. If the plant is green, it is a producer. Plants make food from inorganic molecules.... So the answer is [(F)]