Answer:
D. .................................
a group of cells that are similar in function, structure and origin.
Answer:
The sugar, is used inside cells to modify proteins, turning the proteins off or on, helping or preventing their interactions with other proteins, keeping them from destruction or allowing their destruction.
Explanation:
The best answer to fill in the blank would be A).
Answer:
a free encyclopedia...but probably best not to use it cos apparently anyone can just edit it
