Hair and nails are derived from cells of the
a. skin.
b. bone.
c. blood.
d. fat tissue.

Which of the following would be a body response when stepping outside without a coat on a snowy day? a. senaceous glands. secrete more senum b. more liquid is transported by the body to the skin fir insulation c. blood vessels in the skin narrow and contract d. blood vessels in the skin expand

Nucleic acids offer variability because they contain alternate forms of genes called .

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?