How are cells, tissues, and organs related?

Cells are considered the fundamental units of life. The cells in complex multicellular organisms like people are organized into tissues, groups of similar cells that work together on a specific task. ... At each level of organization—cells, tissues, organs, and organ systems—structure is closely related to function.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg