bradley loved peanut butter sandwiches. he noticed that every time he tried to put the peanut butter on white bread, the bread would tear apart. which would be a good question to guide a scientific investigation on the topic?

a)
why is peanut butter hard to spread?

b)
peanut butter on wheat bread is easiest to spread.

c)
does the brand of peanut butter influence the ease of spread?

d)
if the bread is wheat instead of white, then the bread will not tear.
eliminate

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.