Elaine Morgan’s book The Decent Of Woman cites several human evolutionary changes which which were all adaptations to a marine environment.
1. Upright gait.
2. No fur.
3. Unique downward-turned nostrils.
4. Continuously growing head hair in women.
5. Infant survivability in water.
6. Infant finger grip.
7. Female subcutaneous fat layer.
8. Extra-muscular breasts.
While men were off chasing small animals surviving women were evading predators by running into the surf with their infants.
2. No fur.
Well most of it arm pits and groin to reduce friction hair on head for protection?.
It’s why you smell hair when fast walkers pass you.