Question

which of these cell organelles is most like a post office in that it receives, packages/modifies, then sends proteins and other cellular material? the mitochondria the golgi body

Explanation:

The mitochondria are the powerhouses of the cell, generating energy. The Golgi body, however, is responsible for modifying, packaging, and transporting proteins and lipids within the cell, similar to a post office's functions of receiving, processing, and sending packages.

Answer:

the Golgi body