Which of the following mutations is most likely to result in a heritable change? A. a chemical in cigarette smoke causes a mutation in a lung cell

B. radiation from x-rays causes a mutation in a brain cell

C. ultraviolet light from the sun causes a mutation in a skin cell

D. a substitution in DNA coding causes a mutation in a sperm cell

i think its the first one

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands

japan is the correct anwser because i already took the test and i passed it