if an organism had a mutation that caused its spindle fiber ro not form properly, what phases of the cell cycle would be most directly affected

The chromosomes of the parent cell would not divide.

your best option is 5,000 kg

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.