Air has weight it weighs something. Air is an invisible gas. All living things need air to survive. Trees clean the air. Air is a pillar of the Earth this means it is one of the things Earth needs to survive. we can hear air when it moves through trees or buildings.
The cow eats the grass and it goes through the 4 stomachs and out the outer. The cow eats grass to make milk. The cow eats 40pounds of a day. Cows have 32 teeth. The cow is a female. Cows can live up to 25 years. A cow stands up and sits down about 14 times a day.