Adisease called phenylketonuria causes mental retarnation, reduces skin pigmentation, and also affects the coloration of urine. what kind of effect is exhibited by the gene responsible for this disease?

the second type of galaxy is called a barred spiral, which has a thing called a bar straddling the nucleus

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.