A microbiologist tested 4 substances to find out if they would kill certain types of bacteria. The substances were applied to a plate on which bacteria would normally grow. One week later, the scientist recorded the results in the diagram below.

Based on the diagram, which conclusion is most likely to be correct?
A.
Substance D was able to kill all 3 types of bacteria.
B.
Substance A was able to kill two of the three bacteria types.
C.
Substance B was unable to kill any bacteria.

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.

genetic variation will increase because of a new habitat and food source.

explanation: