3) Are greenhouse gases beneficial? Harmful? Explain your answer.

 Greenhouse gases are harmful to the environment.

Explanation:

greenhouse houses increases global warming and ozone depletion. methane, carbon dioxide, nitrous oxide and other harmful gases from the greenhouses. The combustion of fossil fuels and petroleum releases huge amount carbon dioxide in the environment. The gases trap heat in the atmosphere thus increasing the overall temperature of the earth- global warming. Global warming leads to a series of problems like climate change and ozone depletion.

g1

choices:

a. g2. b. g1. c. m

cell division has two checkpoints namely, g1

checkpoint and spindle assembly checkpoint. the checkpoint which determines if

division has properly occurred is the g1 checkpoint. at this point, is a damage

in the dna is detected or  the has not reach the optimum size, the cell is

stopped in g1 and is not allowed to proceed to further process.

source:

what school and grade?