humans lost fur

Why is fur considered a defining characteristic of mammals?

• It traps air to keep mammals warm.

• It makes mammals immune to UV radiation.

• It helps mammals fly.

• It allows mammals to breathe underwater.

What was the main advantage of bipedalism for early human ancestors?

• It improved their ability to fly.

• It made persistence hunting more efficient.

• It helped them swim better.

• It allowed them to climb trees faster.

Which species is believed to have started losing thick fur due to persistence hunting?

• Australopithecus

• Neanderthals

• Homo sapiens

• Homo erectus

What is the primary function of ecrine sweat glands in humans?

• To protect the skin from UV radiation.

• To help grip objects through friction.

• To cool the body by evaporating sweat.

• To produce pheromones.

Why do humans have vellus hairs instead of thick fur?

• To make their skin waterproof.

• To allow sweat to evaporate efficiently.

• To protect against cold temperatures.

• To help them climb trees.