The correct answer is eukaryotic cells.
Microscopic subunits within the cell represent the organelles found only in complex eukaryotic cell. The communication between those organelles via signal molecules are also a good example of the functioning of eukaryotic cell.
Eukaryotic cell is a cell that contains a nucleus and organelles, and is enclosed by a plasma membrane.
The vertebrate endoskeleton is internal while an arthropod's exoskeleton is not
I’m not sure but I think DNA
The number of organsims at each levels, so there are more producer than herbivores, more herbivores than carnivores and so on...
People with O+ blood cannot donate their blood to negative blood types, while people with O- blood can donate to any blood type. This makes them the "universal donor." However, they can only receive O- blood.
