What is the main method used for studying monozygotic twins that removes the confounding effect of parent-created environments?

Amutagen is 1: a living thing that has undergone a mutation. 2: an agent that causes a mutation in dna. 3: a mutation that has affected one gene. 4: a chemical that can poison living cells.

What do lava flows made of aa indicate about the type of volcanic eruption that occurred? a. the eruption was viscous. b. the eruption was pyroclastic. c. the eruption was explosive. d. the eruption was quite. !

Substances that can pass through cell membranes by diffusion include a. na ions. b. proteins c. glucose. d. oxygen.