The grass on this lawn keeps growing, and so the owner of the house mows the grass. Where do the molecules that grass uses to grow taller come from?

Two years ago, this plant was only 1 foot tall. Now it is 3 feet tall. Where did the matter for its change in height come from?

The matter that these flowers use to grow mainly comes from:

Plants get the matter they need to grow mainly from ​​

True or False: The heart is a muscle

What is the tube that is also known as your wind pipe?