(b)
a student has eaten a steak for dinner. the steak contains protein and fat.
(i)
describe how the protein is digested.

The protein is digested by breaking up all of the fatty acids and then transferring it the the stomach then the protein is used to repair muscle or stored as energy or fat

digestion of protein starts from the stomach, absorbs in the jejenuim after pancreatic juice (pepsin and renin) and bile have finished working on it. Its digestion ends in the ileum which is the final stage of the small intestine

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.