What evidence indicates that all eukaryotes share common ancestry? Linear chromosomes and genes that contain noncoding introns
Circular chromosomes and cells that contain membrane-bound organelles.
Circular chromosomes that do not have terminal ends
Vestigial structures and circular chromosomes
I think is A

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/wzUiVyK

a community that experiences major changes undergoes progress

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.