Predict what the Co, levels will be when you are "old". How many plants/trees need to be planted now to keep carbon dioxide in the atmosphere at its current level or lower?

What must happen before a body cell can begin mitotic cell division

How many moles of air are there in a human lung with a volume of 2.4 l at stp? explain your answer

Why does the sun appear to be the brightest star in the sky? a- its apparent brightness is much greater than other stars. b- it burns more gas, making it brighter than any other star. c- it is the largest star in the galaxy, so it is the brightest star. d- its relative distance to earth is closer than the other stars.