Which of the following types of information are needed to construct a karyotype?
i. size of the chromosomes
ii. gene mutations of the chromosomes
iii. age of the individual
a. i only
b. ii only
c. i and ii only
d. i, ii and iii

i think the answer is a.keratin is the pigment responsible for skin color.

the correct answer is option d.

an appositive is a noun, noun phrase or noun clause which follows another noun or noun phrase in order to describe it or name it another way. they are usually used between commas, brackets or dashes.

the example sentence with the correct use of commas is the following:

her uncle, the man over there in the red shirt, owns the hardware store in town.

its b. greenhouse gasses trap uv rays for heat so that the plants stay alive.