What do many insects and animals feed at?
Options:
- (A) Something that makes plants green
- (B) only higher trophic levels
- (C) one consumer level
- (D) More than one trophic level.
- (E) organic matter
- (F) important habitats
- (G) Microscopic organisms
- (H) less than one trophic level
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Let's think first: Many consumers feed at more than one trophic level. Consumers include insects and animals. Many insects and animals feed at more than one trophic level.... So the answer is [(D)]

What can vaccines do?
Options:
- (A) cause euphoria
- (B) major threat to health
- (C) it protects them
- (D) protect plants
- (E) Keep someone from disease
- (F) cause a disease
- (G) cause a vasectomy
- (H) rapid expansion
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Let's think first: Immunity results from immunization. Immunization with vaccine is effective. The ability of an organism to not be susceptible to a certain disease can result from vaccines.... So the answer is [(E)]

To learn more about the average weather, it is essential to:
Options:
- (A) staying warm
- (B) observe it
- (C) argue about it
- (D) ignore it
- (E) survive
- (F) temperature
- (G) A computer
- (H) write about it
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Let's think first: Climate is the average weather in an area over a long period of time. Along with simulating the climate, it is crucial to observe the climate. It is essential to observe the average weather in one place over time.... So the answer is [(B)]

Muscle and internal organs are protected by:
Options:
- (A) immunization
- (B) fur
- (C) fat
- (D) bone
- (E) hair
- (F) skin
- (G) defense
- (H) copper
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Let's think first: Bone provides protection for soft tissues and internal organs. Soft tissue refers to the soft connective or supporting tissues, such as muscle. Bone provides protection for muscles and internal organs.... So the answer is [(D)]

Emphysema is often cause by exposure to:
Options:
- (A) high temperature
- (B) fog
- (C) Greenhouse gasses
- (D) rays or beams
- (E) hot steam
- (F) tobacco smoke
- (G) Pollution
- (H) incendiary people
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Let's think first: Lung cancer is most often caused by exposure to tobacco smoke. Many patients with lung cancer also have emphysema. Enphysema is often caused by exposure to tobacco smoke.... So the answer is [(F)]

What is a positive effect of plant needs for water and minerals from soil?
Options:
- (A) erosion prevention
- (B) reducing acid rain
- (C) It helps them survive
- (D) agriculture
- (E) nutrient deficiency
- (F) water run-off
- (G) erosion
- (H) Exfoliation
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Let's think first: Most plants grow roots down into the soil to absorb water and minerals. Plant roots begin to stabilize the soil against erosion. The need for plants to absorb minerals and water from the soil also leads to them preventing soil erosion.... So the answer is [(A)]