Annual changes in atmospheric carbon dioxide concentrations occur because O plants in the northern hemisphere lose their leaves during the winter
O photosynthesis stops at night but respiration continues
humans influence carbon dioxide concentrations
carbon dioxide emissions increase in winter

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

answer increasing the intensity, duration,and frequency of exercise progressively;