Which is higher on the food chain?
Options:
- (A) insects
- (B) animals
- (C) humans
- (D) glucose
- (E) decomposers
- (F) herbivores
- (G) producers
- (H) consumers
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Let's think first: Consumers take in food by eating producers or other living things. Decomposers produce nutrients for producers. Decomposers make nutrients for organisms that become food for consumers.... So the answer is [(H)]

How do echinoderms use their feet to locomote themselves?
Options:
- (A) one at a time
- (B) to move people
- (C) running and lifting
- (D) protein channels
- (E) a hydraulic system
- (F) it needs them
- (G) undulations
- (H) It helps them survive
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Let's think first: Echinoderms have a unique water vascular system with tube feet. Echinoderms have a hydraulic system of locomotion called the water vascular system. Echinoderms have a hydraulic system of locomotion with tube feet.... So the answer is [(E)]

What type of evolution is very, very slow above the level of the species?
Options:
- (A) forest is destroyed
- (B) macroevolution
- (C) animals
- (D) parallel evolution
- (E) mechanical
- (F) Continents drifting
- (G) divergent evolution
- (H) microevolution
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Let's think first: Macroevolution is evolution over geologic time above the level of the species. And geologic time is very, very slow. Macroevolution is very, very slow evolution above the level of the species.... So the answer is [(B)]

Marine animals find these to be a great source of food:
Options:
- (A) grain
- (B) nutrient
- (C) sponges
- (D) Energy.
- (E) sea vents
- (F) sodium
- (G) Energy
- (H) fungi
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Let's think first: Sponges are a source of food for many species of fish. Fish and other marine animals abound here. Sponges are a source of food for many marine animals.... So the answer is [(C)]

What is a major route of removing wastes from the body?
Options:
- (A) Detoxifying teas
- (B) Feces
- (C) Burping
- (D) Essential Oils
- (E) glucose
- (F) sodium
- (G) NaCl
- (H) rivers
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Let's think first: Excretion is the process of removing wastes and excess water from the body. Major route of excretion is in the feces. Feces are a major route of removing wastes and excess water from the body.... So the answer is [(B)]

Urine is a product of what organ of the body that is excreted by the urinary system?
Options:
- (A) bowel
- (B) epidermal
- (C) bladder
- (D) alveoli
- (E) lungs
- (F) urine
- (G) mammals
- (H) NaCl
--
Let's think first: Urine is the liquid waste product of the body that is excreted by the urinary system. Liquid waste is put into the bladder. Urine is the waste product in the bladder that is excreted by the urinary system.... So the answer is [(C)]