Jack is planning an experiment to see how temperature can affect the reproduction rate of a certain species of bacteria.

Jack is listing some of the variables that could affect the outcome of the experiment. Which of the following variables should be included on his list?
A.
time of year, clothes Jack wears, Petri dish mass
B.
time of day, color of walls in lab, Jack's height
C.
temperature, light level, species of bacteria
D.
food Jack eats, day of week, number of pages in log book

Hormones are chemical molecules produced by endocrine glands. one such endocrine gland is the thyroid gland, which synthesizes the thyroid hormone, which in turn affects the heart muscles. which two statements describe the probable reason for the function of the hormone? the cells in the heart have specific receptors that allow for the intake of hormones. the heart and the endocrine glands have the exact same types of cells. all cells make the same types of hormones. thyroid hormones show their effect on the heart by means of specialized cells. thyroid cells and cardiac cells have different dna.

Why do you suppose the structural polysaccharide cellulose does not contain branches?

Hich is an example of using comparative anatomy to study evolutionary relationships? comparing and contrasting the dna of two organisms studying the digestive system structure in two organisms using ancient footprints to learn about an organism’s behaviors looking at the development of a fertilized egg of an organism