LAST QUESTION WILL GIVE BRAINLIEST 1. Which two substances have parts of their cycles in which the substance must be "fixed"?

A) nitrogen and water

B) sulfur and oxygen

C) water and phosphorous

i think the answer is g1

hope i

-lavira: )

primary succession occurs in essentially lifeless areas regions in which the soil is incapable of sustaining life as a result of such factors as lava flows, newly formed sand dunes, or rocks left from a retreating glacier. secondary succession occurs