Question

3.12) what is replication in an experiment?
a. doing something over again
b. changing variables in an experiment
c. writing a paper about the experiment
d. making an educated guess for what might happen during
3.13) what is a sample size in an experiment?
a. a type of animal used in the experiment
b. a small part of something that represents something large
c. the amount of substance used in a chemical reaction
d. the type of microscope used to view samples
3.14) what are some variables that can be used in an experiment for plant growth?
a. type of grass, soil, water, location, pots
b. type of grass, soil, cars, books, trees
c. type of grass, soil, pencils, crayons, toys

Explanation:

3.12) Replication in an experiment means repeating the experiment to check results. Option A is correct as it describes doing something over again.
3.13) Sample - size in an experiment is the number of observations in a sample which represents a larger population. Option B describes a small part representing something larger.
3.14) Variables for grass growth can be factors like type of grass, soil, water, location and pots. Options B and C have non - relevant items like cars, books, pencils etc. for grass growth.

Answer:

3.12) A. doing something over again
3.13) B. a small part of something that represents something larger
3.14) A. type of grass, soil, water, location, pots