4. watson and crick were the first to suggest that dna is
a. a short molecule
c. a protein molecule
b. the shape of a double helix
d. the genetic material
1. la
c henartfone chromosomebrealce of

The shape of a double helix

Explanation:

Watson was a Zoologist. He won the Medicine Nobel Prize in 1962. Crick was a Physicist, Molecular Biologist and Neuro scientist. Both joined to investigate the structure of DNA and came up with the double helix model.

a process by which living things produce energy from food. Respiration usually needs oxygen