Vertebrates are animals that have what?
Options:
- (A) major threat to health
- (B) the digestive system
- (C) characteristics
- (D) a three chambered heart
- (E) moving bones and joints
- (F) scales on their skin
- (G) a vertebrate column
- (H) aerobic capacity
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Let's think first: Vertebrates are animals that have a backbone. All vertebrates have a backbone or vertebral column. Vertebrates are animals that have a vertebral column.... So the answer is [(G)]

All redwoods have a characteristic life cycle that includes what?
Options:
- (A) seed dispersal
- (B) alternation stations
- (C) biological diversity
- (D) The flowers are pollinated
- (E) sub-units of species
- (F) alternation of generations
- (G) alternation alteration
- (H) alternation of genetics
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Let's think first: All plants have a characteristic life cycle that includes alternation of generations. All trees are plants, including redwoods. All redwoods have a characteristic life cycle that includes alternation of generations.... So the answer is [(F)]

What crawls and is known to have a complex nervous system?
Options:
- (A) fur seals
- (B) Insects.
- (C) mammals
- (D) animals
- (E) a fish
- (F) humans
- (G) bees
- (H) ducks
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Let's think first: Most invertebrates have a more complex nervous system. Insects are the most common invertebrates. Insects have a more complex nervous system.... So the answer is [(B)]

Fertilization occurs when an egg and what join together to form a diploid zygote?
Options:
- (A) rapid expansion
- (B) testosterone
- (C) gastropod shells
- (D) penis
- (E) peachleaf willow
- (F) pollen
- (G) male hormone
- (H) male gamete
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Let's think first: Fertilization occurs when a sperm and an egg fuse to form a diploid zygote. Male gametes are called sperm. Fertilization occurs when a male gamete and an egg fuse to form a diploid zygote.... So the answer is [(H)]

What do cells make up of organisms?
Options:
- (A) structure only
- (B) function only
- (C) structure and function
- (D) members of their own species
- (E) Something that is self-aware
- (F) share properties
- (G) desires and needs
- (H) Most plants
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Let's think first: Cells are the basic units of the structure and function of living things. An organism is a living thing or something that was once alive. Cells are the basic units of the structure and function of organisms.... So the answer is [(C)]

In their quest for reproduction, salamanders are assisted by their what?
Options:
- (A) animals
- (B) kinetic energy
- (C) sense of irony
- (D) taste in clothing
- (E) fur and fat
- (F) sense of smell
- (G) chameleon
- (H) insects
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Let's think first: Most salamanders use their sense of smell to find a mate. Food to survive, mates to reproduce, and water to drink. To reproduce, salamanders are assisted by their sense of smell.... So the answer is [(F)]