How can scientists ensure that their results are reliable?

They can write a complete description of what they did, and what results they got. Then publish the write-up in a report or magazine that's read all over the world, by other scientists who are working on exactly the same thing. Then all those other scientists can look for mistakes in it, or they can do the same experiment, in the same way or in different ways, and see if they get the same results. Then all of THEM publish THEIR experiments, for everybody ELSE to see, pick apart, and duplicate.

Hey ! This is exactly what real scientists do all the time !

Whaddaya know !

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.