What was Marshall Nirenberg and Heinrich Matthaei’s contribution to our current understanding of the genetic code?

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other

Fossils of ancestors of the modern horses show a small 4-toed almost dog-like browsing animal named eohippus over time the horses got larger lost toes and changed to a grazing diet what is the best explanation of why this change occurred

What are the three different shapes, or structures, of carbon-based molecules