1. what is microevolution?
a genetic changes among and within populations
b evolution of new species
c major changes in populations over a long time
d changes in a population's allele frequencies

A. Genetic changes among and within populations

Explanation:

Macro evolution is the theory that animals evolved over time into new species while micro evolution is more minute changes within a species, like a genetic mutation to help the species adapt to their environment. An example would be of a genetic mutation in the fur color of bears to make different types of bears like black bears, brown bears, polar bears, etc

the backbone of the dna and rna compound is sugar phosphate.