question: Arthropods with what may live in large colonies and have complex social behaviors.
Options:
- (A) fur
- (B) gills
- (C) animals
- (D) complex
- (E) Wasps
- (F) vertebrae
- (G) Flowers
- (H) wings
answer: Insects may live in large colonies and have complex social behaviors. Insects are the only arthropod to have wings. Arthropods with wings may live in large colonies and have complex social behaviors.
The answer is (H)

question: What powers sweat?
Options:
- (A) heat produced
- (B) The body's fuel
- (C) a gas in the air
- (D) hydration
- (E) When the water is hot
- (F) air cools
- (G) matter vibrating
- (H) Cooling vapors
answer: Evaporation of sweat uses energy, and the energy comes from body heat. Energy is the body's fuel. When sweat is evaporated, the body's fuel is used.
The answer is (B)

question: Flukes, tapeworms, and turbell are
Options:
- (A) major threat to health
- (B) types of flat leeches
- (C) Plant growth is reduced
- (D) types of earthworms
- (E) competing for resources
- (F) types of snakes
- (G) types of flatworms
- (H) parasites
answer: Flatworms belong to the phylum Platyhelminthes. Flatworms Flatworms or Platyhelminthes include flukes, tapeworms, and turbellarians. Types of flatworms are flukes, tapeworms, and turbellarians.
The answer is (G)

question: Which animals have a circulatory system?
Options:
- (A) insects
- (B) mammals
- (C) fur seals
- (D) sharks
- (E) cows
- (F) squids
- (G) a fish
- (H) chickens
answer:
Mollusks have a circulatory system with one or two hearts that pump blood. Interestingly, a squid is also a mollusk. Squids have a circulatory system.
The answer is (F)