Me!

from where do scientists think the water on earth might have come?

a. water vapor came out of volcanoes

b. collisions of comets released water

c. violent storms created by dust particles

d. collision of earth with stars

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.