Which is a problem associated with a declining population size ?

a. scarce food supplies
b. limited health care
c. an aging population

hurry

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.

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.