D. before cells without a true nucleus
Probably it would be like a room since the door would be the cell membrane and the nucleus would be your bed not 100% sure tho
Both organs are made up if several kinds of tissues. :D
Explanation:
A cell's lipid bilayer allows to small uncharged substances such as: ions, hydrophobic molecules, oxygen and carbone dioxide to travel through the membrane by simple diffusion
The answer is B. The oak tree. Autotrophs make their own food.
