Which of the following is a mixture?

A. Gold
B. Honey
C. Steel
D. Water

c

Explanation:

cuse steel is an alloy which is a mixture of a metal and non metal

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.

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.