Fact 1: Roundworms make up the phylum Nematoda. Fact 2: Also, nematoda and rotifera are important groups contributing to soils. Given the two facts above, where are roundworms useful in an ecosystem?

OPTIONS:
- killing animals
- soils
- fields
- bacteria
- eating plants
- wetland
- food
- alveoli

Answer: soils

Fact 1: High temperatures can cause an object to combust. Fact 2: Near the sun, of course, the temperature can be very high. Given the two facts above, what can being near the sun do to an object?

OPTIONS:
- Dehydration
- freeze it
- regenerate it
- heal it
- combust it
- Change colors
- heating liquids
- protect them

Answer: combust it

Fact 1: Mollusks are a major food source for other organisms, including humans. Fact 2: Interestingly, a squid is also a mollusk. Given the two facts above, what is a food source for humans?

OPTIONS:
- trees
- sugar
- carbon dioxide
- squid
- rocks
- plants
- dirt
- animals

Answer: squid

Fact 1: Nectar is used for attracting pollinators by plants. Fact 2: Many plants attract bees with the color of their flowers and nectar. Given the two facts above, plants attract bees with what?

OPTIONS:
- male gametes
- organic molecules
- sense organs
- fertilization occurs
- circulatory systems
- color of their flowers
- smell and taste
- Chemical energy

Answer:
color of their flowers