Problem: OPTIONS:
- peristalsis
- chewing
- contraction
- churning action
Q: Q: Which action of the stomach helps chemical digestion by gastric juice? A:
Answer: churning action

Problem:OPTIONS:
- modified sexes
- flexible sexes
- single sexes
- separate sexes

Q: Nearly all fish reproduce sexually and have what? A:
****
A: separate sexes

Q: What substance can be identified by their atomic number and mass number? A:
OPTIONS:
- structures
- compounds
- solutions
- elements
elements

Q: This series of life stages and events that a sexually reproducing organism goes through is called its what? A:
OPTIONS:
- maturation cycle
- development cycle
- formative period
- life cycle

Answer: life cycle

Question: Q: The lithosphere-asthensophere divisions are based on what? A:
OPTIONS:
- mechanical compounds
- elemental properties
- constant properties
- mechanical properties
Answer: mechanical properties

input: OPTIONS:
- maximum energy
- solar energy
- depletion energy
- activation energy Now, answer this question: Q: What term means the minimum energy required in order for a collision between molecules to result in a chemical reaction? A:
A:
output:
activation energy