Human populations living in temperate, northern climates ...

[Evvie72]

Human populations living in temperate, northern climates generally have light skin color because it
 
  A. helps to prevent rickets.
  B. exists in a balanced polymorphism.
  C. helps to prevent sickle-cell anemia.
  D. helps to protect against skin cancer.
  E. protects against hypervitaminosis.

Question 2

________ causes neural tube defects.
 
  A. An overproduction of vitamin D
  B. An underproduction of vitamin D
  C. A diet rich in fatty fishes
  D. The HbS allele
  E. The destruction of folate

[billybob123]

Answer to Question 1

A

Answer to Question 2

E

[Evvie72]

TYSM

[ghepp]

Excellent