What substance is in the outer layer of epithelial cells that protect and waterproof the layers of skin cells beneath it?
(a) keratin
(b) melanin
(c) calcium
(d) fatty tissue

Compare the composition of the moon's surface with the composition of the earth's surface.

Construct at least two possible hypotheses for the student’s experiment.

[34 points awarded to the best answer, use facts and/or data] 1.) what's the likelihood of thunderstorms occurring in the state of maryland? {this question is for a project for science, use facts and/or data and explain why . 34 points to the best answer]