Which is an external environmental factor that affects heredity?

a) gender

b) structural differences

c) nutrition

d) hormones

The correct answer is option C

The external environmental condition that can affect the heredity of the individual is nutrition.

The nutritional requirement of the body should be complete so as to prevent some of the diseases.

The process of digestion, absorption and metabolism is also affected by the heredity of certain diseases which is affected by the external factor such as nutrition.

The answer would be D) hormones