If all living things need nitrogen but almost 80% of the Earth’s atmosphere is N2 gas which is very inert and not biologically available; how was nitrogen made available for the first life that evolved (it will probably shock you)?

kelp are large brown algae that live in cool, relatively shallow waters close to the shore. they grow in dense groupings much like a forest on land. these underwater towers of kelp provide food and shelter for thousands of fish, invertebrates, and marine mammal species.

e) all of the above

what are the awnser choices? i mean, without choices, it is an incompleat