Which of the following structures is an extension of the petiole into the leaf blade?
a. lamina
b. mesophyll
c. midrib

image result for describe the various types of gene mutationsghr.nlm.nih.gov

the types of mutations include: missense mutation: this type of mutation is a change in one dna base pair that results in the substitution of one amino acid for another in the protein made by a gene. nonsense mutation: a nonsense mutation is also a change in one dna base pair.

explanation:

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /