Many cycles on earth involve the conservation of matter. which of the following is not a major cycle on earth?
a. air cycle
b. rock cycle
c. carbon cycle
d. nitrogen cycle

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes