Fact 1: Invertebrates are animals that lack a vertebral column, or backbone. Fact 2: Many invertebrates have an exoskeleton. Given the two facts above, many animals that lack a vertebral column, or backbone have a what?

OPTIONS:
- spine
- exoskeleton
- parasites
- Leptospirosis
- epidermal
- Damaged hearing
- skeleton
- hip bone

Answer: exoskeleton

Fact 1: Arefrigerator is used for keeping food fresh for a long period of time. Fact 2: Refrigerators are major users of electricity. Given the two facts above, keeping food fresh is a major user of what?

OPTIONS:
- kinetic energy
- coal
- eating dinner
- hydration
- heat energy
- growing vegetables
- electricity
- Energy

Answer: electricity

Fact 1: Decomposition increases the amount of nutrients in the soil. Fact 2: Most soil organisms are responsible for decomposition and nutrient cycling. Given the two facts above, what living thing increases nutrients in soil?

OPTIONS:
- snail
- fertilizer
- chemicals
- bushes
- mussels
- plants
- organisms
- compost

Answer: organisms

Fact 1: Feathers help birds fly and provide insulation. Fact 2: Penguins rely on their feathers for insulation. Given the two facts above, what keeps penguins warm?

OPTIONS:
- feathers
- muscles
- Blankets
- Animal fur
- staying warm
- energy
- blood
- fur and fat

Answer:
feathers