Question

learn at https://www.hhmi.org/biointeractive/eukaryotic_cell_cycle_and_
to learn about the cell cycle. answer the questions below.
click on the \background\ tab on the right side. read the information and watch the videos.

1. why is cell division important for both unicellular and multicellular organisms?
2. why does cell division

Explanation:

For unicellular organisms, cell division is the process of reproduction. It allows a single - celled organism to reproduce and increase its population. For example, bacteria reproduce asexually through binary fission (a type of cell division), which enables them to colonize new environments and ensure the survival of their species.

For multicellular organisms, cell division serves multiple purposes:

1. Growth: As an organism grows from an embryo to an adult, cell division is responsible for increasing the number of cells. For instance, in a human, from a single - celled zygote, trillions of cells are produced through successive cell divisions during development.
2. Repair: When cells are damaged due to injury or normal wear - and - tear, cell division helps in replacing the damaged cells. For example, if you cut your skin, the cells at the site of the cut will divide to repair the damaged tissue.
3. Maintenance: It also helps in maintaining the normal functioning of the body by replacing old or dead cells. For example, red blood cells have a limited lifespan (about 120 days in humans), and new red blood cells are produced in the bone marrow through cell division to replace the old ones.

Answer:

For unicellular organisms, cell division is reproduction (e.g., bacteria reproduce via binary fission). For multicellular organisms, cell division is for growth (e.g., zygote to adult human), repair (e.g., skin wound healing), and maintenance (e.g., replacing old red blood cells).