Multiple questions:
16. in what part of the leaf are the chloroplasts found?
17. what does the cuticle protect the plant from?
18. what type of tissue surrounds the chloroplasts and the xylem and phloem?

Explanation:

16. mesophyll part

17. bacteria and dessication

18. cellulose

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

label a cell membrane

label b cytoplasm

label c ribosomes

label d dna

the membrane forms the outside of the cell

cytoplasm is the liquid within

ribosomes are the components within that distribute rna

the dna is the genetic make-up