What phylum do starfish belong to?
Options:
- (A) fertile
- (B) animals
- (C) Echinoderm.
- (D) Mollusca.
- (E) Sponge.
- (F) Absorb light
- (G) Annelid.
- (H) a fish
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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 echinoderms.... So the answer is [(C)]

What treatment can be used in treating pneumonia?
Options:
- (A) the respiratory system
- (B) a breathing mask
- (C) bronchodilatory treatment
- (D) aqueous solution
- (E) immunotherapy
- (F) radiation therapy
- (G) immune system
- (H) chemotherapy
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Let's think first: Pneumonia may be caused by an infection or injury of the lungs. Lung injuries are treated with bronchodilatory treatment. Pneumonia can be treated with bronchodilatory treatment.... So the answer is [(C)]

What are important biomes?
Options:
- (A) important habitats
- (B) fruits, vegetables and plants
- (C) retaining heat
- (D) stars, comets and planets
- (E) cats, dogs and humans
- (F) absorb light energy
- (G) marshes, bogs, and swamps
- (H) remains of prehistoric life
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Let's think first: Wetlands are extremely important biomes. Palustrine wetlands include marshes, bogs, and swamps. Marshes, bogs and swamps are very important biomes.... So the answer is [(G)]