*Question*
Q: Acting like drawstrings to close off the alimentary canal, what regulates the passage of material between compartments? Read this paragraph and choose the correct option from the provided answers: Choices: - intestine - hamstring - uterus - sphincter A:
**Answer**
sphincter

*Question*
Q: What is an insect's hard outer exoskeleton made out of? Read this paragraph and choose the correct option from the provided answers: Figure 3.11 Insects have a hard outer exoskeleton made of chitin, a type of polysaccharide. (credit: Louise Docker). Choices: - lectin - casein - melanin - chitin A:
**Answer**
chitin

*Question*
Q: Original atoms are called what type of isotopes? Read this paragraph and choose the correct option from the provided answers: Direction is an important component of motion. Choices: - offspring - component - product - parent A:
**Answer**
parent

*Question*
Q: What do most ecosystems get energy from? Read this paragraph and choose the correct option from the provided answers: When it comes to energy, ecosystems are not closed. They need constant inputs of energy. Most ecosystems get energy from sunlight. A small minority get energy from chemical compounds. Unlike energy, matter is not constantly added to ecosystems. Instead, it is recycled. Water and elements such as carbon and nitrogen are used over and over again. Choices: - magma - moisture - evaporation - sunlight A:
**Answer**
sunlight