A mother passes on her mt(DNA) or mitochondrial DNA which sometimes includes genetic material but a father only passes down a Y chromosome if he has a son. No genetic material.
Doctors recommend that infants should not be given cows milk until at least 1 yrs old, and whole milk (specifically) until she/he is 2 year or older, due to allergies and iron-deficiency anemia.
More info can be found here: http://www.parenting.com/article/ask-dr-sears-cows-milk-for-babies
Answer:
a light year is 2 seconds
Number 5 would be the best awnser.
As a scientist who remains impartial can more accurately conclude his data while doing experiments.