Answer:
OA.
Their cells all contain a membrane-bound nucleus.
Explanation:
it can not be the option B because not all eukaryotic species have a cell wall, animals for example.
In option C plants are eukaryotic, but they are stuck on the ground and cannot move around the environment.
option D, fungi and animals are not able to do photosynthesis, they are heterotrophs.
Ribosomes make proteins for the cell and Mitochondria use sugar and oxygen to release energy that is used by the cell. ER helps make proteins (ribosomes) and also lipids. Chloroplasts turn sunlight, carbon dioxide, and water into food (glucose).
Oxygen and carbon dioxide move across a cell membrane due to diffusion. Diffusion is a passive process as it requires no energy to move particles down the concentration gradient.