Question

transport of molecules within animal cells is assisted by a system of internal membranes that make up the
(1 point)
○ chloroplasts
○ cell wall
○ mitochondria
○ endoplasmic reticulum (er)

Explanation:

The endoplasmic reticulum (ER) is part of the endomembrane system in animal cells. It helps in the transport of molecules. Chloroplasts are in plant cells, the cell - wall is also a plant cell feature, and mitochondria are mainly for energy production, not primary molecule - transport within the cell's internal membrane system.

Answer:

D. endoplasmic reticulum (ER)