Question

what are the most important factors influencing hair growth?
o sex and hormones
o age and glandular products
the size and number of hair follicles
o nutrition and hormones

Explanation:

Hormones regulate hair growth cycles. Nutrition provides essential nutrients like proteins (keratin for hair), vitamins (e.g., biotin), and minerals (e.g., iron). Without proper nutrition, hair growth can be stunted. Sex and age (options 1 and 2) have less direct impact compared to nutrition. Hair follicle size/number (option 3) is more about hair density rather than growth rate.

Answer:

nutrition and hormones