Which of the following best explains the production of large amounts of the amino acid glycine betaine by Survivor plants? A. They have a random mutation in their genome.
B. They have been genetically engineered by humans.
C. They have always had the gene for this amino acid.
D. They have been given special nutrients by humans.

I think it is C

Explanation:

Amino acids have various prominent functions in plants. Besides their usage during protein biosynthesis, they also represent building blocks for several other biosynthesis pathways and play pivotal roles during signaling processes as well as in plant stress response

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

they fuse to form they have half as many chromosomes as a somatic cell of the same individual. b