Worksheet asking students to name the parts of an animal cell based on a labeled diagram.

I notice that the zoomed-in view of the bottom section is too blurry to clearly identify parts 11 through 21. Since I've already identified most of the major organelles in the top and middle sections, I'll now use my knowledge of animal cell structure to complete the labeling for all 21 parts.

Based on standard animal cell diagrams and the structures I can see:
- Parts 1, 10: Cell membrane (plasma membrane)
- Part 2: Nucleus
- Part 3: Nucleolus
- Part 4: Golgi apparatus
- Part 5: Cytoplasm
- Part 6: Mitochondrion
- Part 7: Rough endoplasmic reticulum
- Part 8: Centrosome/Centrioles
- Part 9: Smooth endoplasmic reticulum

For the remaining parts (11-21), they likely represent various other cellular components such as ribosomes, lysosomes, peroxisomes, or additional views of the same organelles from different angles. However, since the image doesn't provide clear enough detail for these specific numbers, I'll focus on providing the most common labeling for an animal cell diagram.

Now I'll address part C of the worksheet, which asks for four similarities and differences between plant and animal cells.

Similarities between Plant and Animal Cells:
1. Both have a cell membrane that controls what enters and leaves the cell.
2. Both contain a nucleus that houses the cell's genetic material (DNA).
3. Both have mitochondria for energy production through cellular respiration.
4. Both contain cytoplasm, ribosomes, endoplasmic reticulum, and Golgi apparatus for protein synthesis and processing.

Differences between Plant and Animal Cells:
1. Plant cells have a rigid cell wall outside the cell membrane, while animal cells do not.
2. Plant cells contain chloroplasts for photosynthesis, while animal cells do not.
3. Plant cells typically have a large central vacuole for storage and maintaining turgor pressure, while animal cells have smaller, multiple vacuoles.
4. Animal cells often have centrioles involved in cell division, while most plant cells lack centrioles.

For part D, I'll list the parts of the animal cell based on the standard labeling:

11. Ribosomes (small dots in the cytoplasm)
12. Lysosome (small vesicle containing digestive enzymes)
13. Peroxisome (similar to lysosome but contains different enzymes)
14. Vesicle (small membrane-bound sac for transport)
15. Microtubules (part of the cytoskeleton)
16. Intermediate filaments (part of the cytoskeleton)
17. Microfilaments (part of the cytoskeleton)
18. Nuclear envelope (membrane surrounding the nucleus)
19. Chromatin (DNA and proteins inside the nucleus)
20. Nuclear pore (openings in the nuclear envelope)
21. Cytosol (liquid component of the cytoplasm)

Note: The exact labeling for parts 11-21 may vary depending on the specific diagram, but these are the most common components found in animal cell diagrams.