What do you think “exo” means in the word exoskeleton? (As a hint, humans have an “endoskeleton.

Outer skeleton

Explanation:

"Exo" means outer and "Endo" means Inner which is why we have an endoskeleton so we have an Inner skeleton and to answer your quest Exo means outer so it means outer skeleton

C. An approximately three-to-one ratio of black to brown coated mice in F2 is accounted for by the black allele being dominant over the brown allele

Explanation:

Assuming the black genotype is BB and the brown genotype is bb.

At F1:

                 BB   x   bb = All Bb (black)

At F2:

                  Bb   x   Bb = BB (black), 2Bb (Black), bb (brown)

Th ratio of black to brown is 3:1

961 black : 317 brown is approximately 3:1.

Hence, the correct option is C.

An approximately three-to-one ratio of black to brown coated mice in F2 is accounted for by the black allele being dominant over the brown allele