Most _ feed on bacteria and algae that use sunlight to make food.
Options:
- (A) Energy
- (B) Lobsters
- (C) Most plants
- (D) Seaweed
- (E) Starfish
- (F) plant life
- (G) Copepods
- (H) energy usage
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Let's think first: Phytoplankton are bacteria and algae that use sunlight to make food. Most copepods feed on phytoplankton. Most copepods feed on bacteria and algae that use sunlight to make food.... So the answer is [(G)]

What can lead to bullying?
Options:
- (A) Cooperation
- (B) Isolation
- (C) Damaged hearing
- (D) Perfection
- (E) Competition
- (F) negative
- (G) smoking tobacco
- (H) heat or cold
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Let's think first: Competition may lead to aggressive behaviors or displays of aggression. Aggressive behavior is often first recognized as bullying behavior. Competition can result in bullying.... So the answer is [(E)]

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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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)]

What is something cells cannot survive without?
Options:
- (A) gas
- (B) Air
- (C) O2
- (D) CO2
- (E) Ca
- (F) O3
- (G) Fe
- (H) He
--
Let's think first: Cells cannot survive without oxygen. And oxygen, O2, is the molecule to do it. Cells cannot survive without O2.... So the answer is [(C)]

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
--
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)]

What release oxygen during the day but not at night?
Options:
- (A) sea anenomes
- (B) Organic compounds
- (C) orange trees
- (D) coral
- (E) power stations
- (F) humans
- (G) swamp vegetation
- (H) important habitats
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Let's think first: Plants release oxygen during the day but not during the night. All orange trees are plants. Orange trees release oxygen during the day but not at night.... So the answer is [(C)]