HELP ME I DON”T UNDERSTAND AND IT”S MULTIPLCE CHOICE PLZZZ

If a terrestrial ecosystem has a net primary production of 3000 J/m2 *yr and an Ra of 2000, what is the gross primary production for this ecosystem?

A. 100
B. 500
C. 1000
D. 5000

How does buring fossil fuels impact does carbon cycle? what large impact does this have on the envirnment?

Last week i was assigned a thematic. we have groups of three but the people i was assigned with haven't been in school for days. i would appreciate if anyone can me with my thematic . i highlighted most of the important steps and i circled my thematic topic. in desperate need : ( its due on february 19

In pea plants, yellow seed color (y) is dominant and green seed color (y) is recessive. based on the punnett squares, what are the chances that the offspring in the second generation will have green seeds?