When heating a liquid in a test tube, a student should always 1

wear safety goggles

2.

use Benedict's solution

3.

stopper the test tube

record the temperature of the liquid

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

b.animal breeder

e.baker