Question

which organelle is unique to animal cells and helps with cell division?

Explanation:

To determine the organelle unique to animal cells and involved in cell division, we analyze the options (assuming the labeled organelle 4 is the centrosome/centriole, as that's the organelle unique to animal cells for cell division).

Step 1: Recall organelles in animal cells

Animal cells have organelles like centrioles (part of the centrosome), which are not found in plant cells. Centrioles help in organizing microtubules during cell division (mitosis/meiosis), forming the spindle apparatus.

Step 2: Identify the organelle

Looking at the diagram, the organelle labeled (likely 4, based on typical animal cell diagrams) that aids in cell division is the centriole (or centrosome). Centrioles are unique to animal cells (and some lower plants) and play a key role in cell division by helping form the mitotic spindle.

Answer:

The organelle unique to animal cells and helping with cell division is the centriole (or centrosome, corresponding to the labeled structure, e.g., label 4 in the diagram).