How many factors should a well-designed experiment test at one time?

1
2
3
depends on the number of experiment variables

What food can provide the body with a quick source of the energy needed to carry out cell functions (a) whole grain bread (b) ground hamburger (c) vegetable oil (d) whole milk

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry

Brian has a medical condition called cone dystrophy, which is a disorder of the cone cells in the eye. what symptoms would you expect brian to have? a. inability to see in the dark b. difficulty determining colors c. difficulty determining shapes and outlines d. inability to see in all light conditions