Why are cells generally so small? Select all of the answers that apply.

A) As they grow, their volume increases faster than their surface area.

B) As they grow, their surface area increases faster than their volume.

C) Moving nutrients across their cell membranes is more efficient.

D) Moving waste materials across their cell membranes is more efficient.

where is the scientific experiment?

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.

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?