Answer:
According to the current fossil record, scientists believe that the life on earth began about 3.5 billion years ago.
1, 2, and 3 all apply.
Hope this helps!! (If not sorry!)
Explanation:
the answer is d, the DNA must be replicated.
The units of evolution are populations and not individuals because a variation or a mutation in an individual is not sure to last or produce offsprings having the same variation or mutation. The proof that a species has truly evolved is when the variation has allowed the species to survive its environment and produce generations carrying the same variation.
