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

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

In what part of a chloroplast does glucose production occur? a. atp synthase b. photosystem ii c. photosystem d. stroma

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution