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)]

Plants make food from what?
Options:
- (A) Chemical energy
- (B) inorganic molecules
- (C) photosynthesis
- (D) Light passing through water
- (E) direct energy
- (F) absorb light energy
- (G) Organic compounds
- (H) In their leaves
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Let's think first: Producers make food from inorganic molecules. Plants are known as producers . Plants make food from inorganic molecules.... So the answer is [(B)]

Heavy metals are _.
Options:
- (A) emissions
- (B) dangerous
- (C) bent
- (D) homogenous
- (E) antigens
- (F) vehicles
- (G) fossil fuels
- (H) heat energy
--
Let's think first: Antigens are molecules that the immune system recognizes as foreign to the body. Heavy metals are, in general, foreign to the body. Heavy metals are antigens.... So the answer is [(E)]

Protonemas develop into what?
Options:
- (A) alveoli
- (B) ferns
- (C) lmestone
- (D) disease
- (E) illness
- (F) parasites
- (G) gas
- (H) spores
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Let's think first: Flowers produce spores that develop into gametophytes. Gametophytes arise from a protonema. Flowers produce spores from a protonema.... So the answer is [(H)]

What has a nervous system?
Options:
- (A) Nerve tonic
- (B) Jellyfish
- (C) Air
- (D) fur seals
- (E) Cardiovascular system
- (F) animals
- (G) chickens
- (H) elephants
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Let's think first: Most invertebrates have a nervous system. Jellyfish and insects are invertebrates. Jellyfish have a nervous system.... So the answer is [(B)]

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
--
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)]