Neurotransmitter molecules are removed from a synapse by

a) being abosorbed by adjoining muscle tissues
b) being broken down by enzymes
c) being reabsorbed by the presynaptic neuron
d) both (b) and (c)

Carbon-14 has a half-life of 5,730 years and most igneous rock is older than that.

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The answer would be c, white eyes are homozygous recessive. in the early 1900s, morgan conducted several experiments with vinegar  flies (drosophila). one  sample revealed an anomaly: a  white-eyed, single male fly. he attempted to breed this fly with the typical red-eyed females. the offspring were all red-eyed. using flies from this new generation (brother-sister pairs)  produced some red-eyed and a few white-eyed flies. the white-eyed were all male. in later experiments, he was able to produce white-eyed females. this proved that white eyes are not lethal to either sex (ruling out a and b). since the percentage of white eyes to red eyes is so low, white eyes are not a dominant trait. it would be a recessive trait.