When a snake or lizard's tongue is drawn back into the mouth, it is inserted into a structure called the where the chemical molecules are analyzed.
a. nasonov gland
c. jacobson s organ
b. carapace
d. spiracle?

what have scientists found to be the most efficient and effective way to insert new sequences into an individual? a-scientists have created genetically altered foods that release dna during digestion. b-scientists use viruses to insert specific gene sequences. c-scientists irradiate genes so that they can be absorbed through the skin.