Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: In sexually reproducing organisms, parents pass a copy of each type of chromosome to their offspring by producing gametes. When gametes are fertilized and form offspring, each has a unique combination of chromosomes and genes from both parents. The inherited gene combination determines the characteristics of the offspring. Answer: chromosome
[EX A]: In sexually reproducing organisms, parents pass a copy of each type of what to their offspring by producing gametes?

[EX Q]: Passage: A variable is a factor that can change over the course of an experiment. Independent variables are factors whose values are controlled by the experimenter to determine its relationship to an observed phenomenon (the dependent variable). Dependent variables change in response to the independent variable. Answer: independent variables
[EX A]: The values of which factors are controlled by the experimenter over the course of an experiment?

[EX Q]: Passage: How fast a chemical reaction occurs is called the reaction rate . Several factors affect the rate of a given chemical reaction. They include the:. Answer: reaction rate
[EX A]:
What term is used to describe how fast a chemical reaction occurs?