He life expectancy in the united states increased more than 30% from 1930 to 2015. which factor could have contributed to this increase?

a.
better medical facilities and treatments
b.
decreased farmland
c.
increased food insecurity
d.
refusal of vaccines

dna damages cause changes in the structure of the genetic material and prevents the replication mechanism from functioning and performing properly. dna damage and mutation have different biological consequences. while most dna damages can undergo dna repair, such repair is not 100% efficient.

50% lit on the left side

paper covers rock.

explanation:

rock only smashes scissors.