Say true or false
we live in the layer of the atmosphere called troposphere?

True

Explanation:

We live in the lowest section of the atmosphere(blanket of gas that surrounds the earth) called the troposphere which is 11km deep on average. Most gas molecules are in the troposhere because they are pulled down by gravity and hence it is where most weather occurs.Above it there is no rain.

a and b because with the other three, they simplify to something else.

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.