Answer:
The independent variable is "controlled" or held constant in the control group. A single experiment may include multiple experimental groups, which may all be compared against the control group. The purpose of having a control is to rule out other factors which may influence the results of an experiment.
Explanation:
Answer:
well the plants live and die from life to death they get there nutrients from water from rain. and oxygen from the air and nitrogen from the ground. the plant grows and dies. when it dies it decompose and puts nitrogen back into the soil along with the seeds that where produced in it's life time.
Answer:
gene
Explanation:
the genes that code for protein are made up of tri-nucleotide units called condons
Blood vessels in the ear dilate or constrict to help regulate body temperature.
