Which of these serves as a reference for comparison during a scientific investigation?

group of answer choices

test variable (independent variable)

hypothesis

outcome variable (dependent variable)

control group

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

compost can be added to topsoil as a:

pesticide

both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.