Questions by Cheng Zhang

Questions by Cheng Zhang

Natural systems (respiring animals, decomposition, fires, the ocean) contribute approximately 700 giga-tons of Carbon (GtC) to the atmosphere each year. About how much Carbon do human activities contribute

asked Jan 14, 2021

1 answer

4 votes

123k views

Why did the American expeditionary forces go to Europe in 1917

asked Jan 3, 2021

1 answer

2 votes

40.3k views

Plz show that \tan( (\pi)/(4) - \alpha ) \: \tan( (\pi)/(4) + \alpha ) = 1

asked Dec 11, 2020

1 answer

3 votes

45.5k views

How do cells combine and reproduce to create different combinations of DNA in babies?

asked Oct 19, 2020

1 answer

2 votes

2.6k views

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