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 gets converted into the type of energy that animal cells need?
Options:
- (A) photosynthesis
- (B) solar energy
- (C) sugar
- (D) UV
- (E) food
- (F) water
- (G) Energy
- (H) Light
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Let's think first: Glucose is used for energy by the cells of most organisms. Food is converted into glucose. Food is converted into the type of energy that most cells use.... So the answer is [(E)]


Something in the polyp stage can form large colonies in shallow tropical what?
Options:
- (A) mountains
- (B) ice
- (C) porous
- (D) CO 2
- (E) complex
- (F) colonies
- (G) wetland
- (H) water
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Let's think first: Corals form large colonies in shallow tropical water. Corals Corals are in the polyp stage. Something in the polyp stage can form large colonies in shallow tropical water.... So the answer is [(H)]


What enables bones to perform movement?
Options:
- (A) contraction
- (B) Energy
- (C) sensory neurons
- (D) looseness
- (E) Chemical energy
- (F) Vibrates
- (G) fur and fat
- (H) layers of fat
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Let's think first: Muscles can only contract. Bones work with muscles to perform movement. Contraction enables bones to perform movement.... So the answer is [(A)]


Mutations that lead to cancer usually effect genes that aid in what?
Options:
- (A) illness
- (B) health
- (C) disease
- (D) blood transfer
- (E) chemotherapy
- (F) respiraration
- (G) mitosis
- (H) recovery
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Let's think first: Mutations that lead to cancer usually occur in genes that control the cell cycle. Mitosis is part of the cell cycle. Mutations that lead to cancer usually occur in genes aiding in mitosis.... So the answer is [(G)]


What part of a tree would be woody and covered in bark?
Options:
- (A) shrub beds
- (B) the leaves
- (C) the roots
- (D) cacti
- (E) a sapling
- (F) Chlorophyll
- (G) the trunk
- (H) four limbs
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Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Let's think first: Trees have woody stems covered with bark. Stems of plants include trunks and branches. Trees have woody trunks covered with bark.... So the answer is [(G)]