Fact 1: Grasses supply most of the food consumed by people worldwide. Fact 2: Grasses are also important food for waterfowl. Given the two facts above, important food for waterfowl supply most of the food consumed by what?
OPTIONS:
- agriculture
- it needs them
- keeps the organism warm
- people worldwide
- our planet
- monkeys in trees
- tigers in the wild
- wolves in nature

Answer: people worldwide

Fact 1: Amphibians have a relatively complex circulatory system with a three-chambered heart. Fact 2: Frogs, toads and salamanders are amphibians. Given the two facts above, what sort of circulatory system do frogs, toads, and salamanders share?
OPTIONS:
- live birth
- It helps them survive
- matter vibrating
- two-chambered heart
- Veins and arteries.
- biological diversity
- three-chambered heart
- four-chambered heart

Answer: three-chambered heart

Fact 1: Gills are used for breathing water by aquatic animals. Fact 2: Crustaceans are predominantly aquatic, breathing by means of gills. Given the two facts above, crustaceans breathe what through their gills?
OPTIONS:
- matter
- water
- saliva
- gametes
- semen
- liquid
- oxygen
- air

Answer:
water