Which part of the nucleotides' structure is responsible for the incredible variation that exists amongst all types of organisms? *
A) Sugar (ribose)
B) Nitrogenous base
C) Sugar (deoxyribose)
D) Phosphate group (-PO4)

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

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.