“Past mitochondrial and Y chromosome analyses that suggested a non-European location for the onset of domestication were more limited in sampling of modern or ancient wolves or prehistoric dogs and had weak statistical support for phylogenetic branching points.” Previous studies suggested a non-European origin for dogs. Why do you think the number of samples used affects evolutionary studies?

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.

digestion

it excretes wastes

sorry, is there a picture? i do not see any arrows.

wut? unius0123 wut?

a = executive branch; b = judicial branch