Solution idea: Earthworm burrows help aerate soil, which is also good for plants. Aerating means getting air into the wine. Earthworm burrows help getting air into soil, which is also good for plants.
Q: Earthworm burrows are good for plants because they
Options:
- (A) get air into soil
- (B) reducing acid rain
- (C) eliminate toxins
- (D) hydrate roots
- (E) preventing heat transfer
- (F) It helps them survive
- (G) kill pests
- (H) important habitats
A: (A)

Solution idea: Most plants continue to grow throughout their lives. Lilies continually produce new bulbs, from which grow new plants. Lilies continue to grow throughout their lives.
Q: What continues to grow throughout their lives?
Options:
- (A) potatoes
- (B) Hemoglobin
- (C) tortoises
- (D) plastic roses.
- (E) Human teeth.
- (F) Lilies.
- (G) Silk daisies.
- (H) vegetation
A: (F)

Solution idea: Behaviors that improve fitness increase through natural selection. Many organism behaviors have evolved through natural selection. An organism's fitness is a result of evolution.
Q: What is one of the facets of an organism's evolution?
Options:
- (A) resistance
- (B) fitness
- (C) properties
- (D) thirst
- (E) movement
- (F) swimming
- (G) offspring
- (H) recycling
A: (B)

Solution idea: 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.
Q: 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
A: (D)