Does anyone know why plants need carbon dioxide from the air

For plants to perform photosynthesis they require light energy from the sun, water and carbon dioxide.

yes plants require sunlight , water and carbondioxide for photosynthesis. So they are important for plants

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

check for the pregnancy rating of drug. if its class c or d see if other alternatives