A researcher records the following number of birdcalls made during an experimental session with robins: 7.2±0.6 (M±SD). Assuming these data are normally distributed, what is the probability that robins made more than 9 birdcalls during this experimental session?

c

explanation:

idk

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.

the answer is c.

by: nicholas dooley