What was marshall nirenberg and heinrich matthaei’s contribution to our current understanding of the genetic code?
a.) discovery of codons
b.) discovery and extraction of dna
c.) creation of a model of dna
d.) creation of photo 51

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

Explain how scientists use geologic time to determine the age of landforms.

The spermists believed that: the male made the only hereditary contribution to the offspring the male and female traits were blended in the offspring the female made the only hereditary contribution to the offspring the male and the female made equal contributions to the next generation