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, answer the question "Where are roundworms useful in an ecosystem?" with the following options: - killing animals - soils - fields - bacteria - eating plants - wetland - food - alveoli
soils

Fact 1: Grasses supply most of the food consumed by people worldwide. Fact 2: Grasses are very distinctive plants. Given the two facts above, answer the question "Most of the food consumed by people worldwide comes from" with the following options: - humans - trees - Energy - animals - plants - vitamin C - honeybees - Earth
plants

Q: Fact 1: Most salamanders use their sense of smell to find a mate. Fact 2: An odor, by definition, is a sensation, stimulation or perception of the sense of smell. Given the two facts above, answer the question "Most salamanders find mates by what?" with the following options: - perceiving odors - Chemical energy - competing for resources - releasing colors - mechanical waves - during the day - spreading germs - sharing food
A: perceiving odors

Question: Fact 1: Fungi are the only organisms that can decompose wood. Fact 2: Wood was made from trees, and the wood was used in many different ways. Given the two facts above, answer the question "What can fungi decompose?" with the following options: - mildew - sound - taste - bushes - bamboo - peat - trees - oil
Answer: trees

*Question*
Fact 1: Acavern is formed by carbonic acid in groundwater seeping through rock and dissolving limestone. Fact 2: When caves contain connecting rooms, they are called caverns. Given the two facts above, answer the question "What is one element used to create caves?" with the following options: - sunlight - heat energy - Calcium carbonate - hydrogen and oxygen - calcite - carbonic acid - less water - salinity
**Answer**
carbonic acid

Fact 1: Tunicates reproduce sexually. Fact 2: Tunicates, or sea squirts, are marine organisms covered with a gelatinous tunic. Given the two facts above, answer the question "How do sea squirts reproduce?" with the following options: - movement - competition - seeds - Sexually - evaporation - adding heat - allow growth - grow
Sexually