Problem: OPTIONS:
- peristalsis
- chewing
- contraction
- churning action
Q: Answer the following question given this paragraph: 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

Answer the following question given this paragraph: Nearly all fish reproduce sexually and have separate sexes. Q: Nearly all fish reproduce sexually and have what? A:
****
A: separate sexes

Answer the following question given this paragraph: Elements can be identified by their atomic number and mass number. Q: What substance can be identified by their atomic number and mass number? A:
OPTIONS:
- structures
- compounds
- solutions
- elements
elements

Answer the following question given this paragraph: Sexual reproduction occurs in a cycle. Diploid parents produce haploid gametes that unite and develop into diploid adults, which repeat the cycle. This series of life stages and events that a sexually reproducing organism goes through is called its life cycle . Sexually reproducing organisms can have different types of life cycles. Three are described in the following sections. 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: Answer the following question given this paragraph: The lithosphere-asthensophere divisions are based on mechanical properties. 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: Answer the following question given this paragraph: Summary A minimum energy (activation energy, Ea) is required for a collision between molecules to result in a chemical reaction. Plots of potential energy for a system versus the reaction coordinate show an energy barrier that must be overcome for the reaction to occur. The arrangement of atoms at the highest point of this barrier is the activated complex, or transition state, of the reaction. At a given temperature, the higher the Ea, the slower the reaction. The fraction of orientations that result in a reaction is the steric factor. The frequency factor, steric factor, and activation energy are related to the rate constant in the Arrhenius equation: k = Ae - Ea / RT. A plot of the natural logarithm of k versus 1/T is a straight line with a slope of Ea/R. Saylor URL: http://www. saylor. org/books. 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