Question

Reason for the diffusion of oxygen from alveoli to blood
A Low concentration of oxygen in blood.
As the walls of the alveoli and blood vessels are thin
C. High concentration of oxygen in alveoli.
DAll the above.​

Answer 1

Answer:

Option A is probably your answer

Answer 2

Explanation:

Fire provided a source of warmth, protection from predators, a way to create more advanced hunting tools, and a method for cooking food. These cultural advances allowed human geographic dispersal, cultural innovations, and changes to diet and behavior.