Anthropology

Hello, I have an Anthropology class assignment needs help.

Please address all of the points below. 

The phases of human development are biologically defined. How, if at all, can they also be culturally defined? 

What is the evolutionary relationship between vitamin D, folate, melanin, and sunshine? How is fitness (having more and healthy offspring) effected by this? 

Please describe the way race can or cannot be a biologically valid concept.

You need to write at least 200 words to answer the questions.

Please follow the instructions carefully and finish the work before due. Thank you.