Organ is an organism that is a collection of tissues and it perform a specific functions.It is found in the higher biological systems like plants, animals, and human beings. While the organelle is a part of a cell that specialized units and capable of performing a specific function for the cell. It is a very small subunits inside a cell.
The structure is calcium ions.
A change in the substance by temp, color,
The pancreas’s main function is to produce substances that help digest food.
Its D all of them are correct