What is humidity?

a. A measure of how warm it is outside
b. A measure of how much water vapor there is in the air
c. A measure of how many clouds there are in the area
d. A measure of how much rain there is in the upper atmosphere

A measure of how much water vapor there is in the air.

Explanation:

Dampness, especially that of the air.

The amount of water vapour in the air.

Hope it will help you :))

the answer is d.) homologous; have mammary glands

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