Protozoa absorb oxygen A into the nucleus B though their cell walls C by mitosis D by osmosis

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck

c) 50% there are four chromosomes. after crossing over, 2 of the four have been changed. that means any gamete has a 2 in 4 chance or 50% chance of receiving the mutated chromosome.