Why is vascular tissue so important to plants? A. because it protects the leaf and helps it to retain moisture
B. because it carries out photosynthesis
C. because it allows water and nutrients to be easily transported throughout the plant
D. because it helps the plants to be anchored so they aren't blown away by strong winds

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.

layer 3 is younger than layer 6.

protistas excret ethanol used in the manufacture of vinegar