3 cell parts that are important to the cell are the nucleus, the choroplasts, and the vacole. The nucleus is importnt because it stores all the DNA. The choroplasts are important because they help plant cell grow anhd they give animal cells energy. The vacole is important because it stores all the extra stuff that the plant cell dosent need

You can get the volume of an irregular shaped object by putting the object in water and by measuring how much liquid it pushes out of the way. For example I have a graduated cylinder and it has 70 ml of liquid in it and i put a rock in it and the water goes to 80 ml of liquid . Since the the rock pushed the liquid up to 80 ml the rocks volume is 10 ml.