Why Might Archaea Be More Difficult to Grow in the Lab

Why might Archaea be more difficult to grow in the lab than Bacteria?

A) Archaea are larger cells and thus take in more food.
B) Archaea are much smaller than bacteria and are harder to see growing.
C) Archaea often grow in unusual environments that would be hard to reproduce in the lab.
D) Archaea don't usually reproduce in captivity.