There are four major classes of biological macromolecules:
carbohydrates.
lipids.
proteins.
nucleic acids.
The variable that researchers manipulate is the independent variable.
The reason for this is because in experiments different manipulations are often introduced. The sole purpose of these manipulations is to see whether they will affect our independent variable and if they will change its value.
Answer:
6 for white parents, and 6 for black parents.
A specific group of bacteria called the lactic acid bacteria (Lactobacillus species) that produces lactic acid as they grow.
Answer:
An experiment that directly test the hypothesis.
Explanation:
Although there is quite a bit missing from Mary's scientific investigation, the thing that sticks out the most is the fact that Mary is missing an experiment. Mary's hypothesis states that people would fall asleep faster if their room color were to be painted blue. To prove that her hypothesis is true, Mary would need to conduct an experiment to see whether or not she was correct.
