Question

1. a ______ is the smallest unit of structure and function of a living thing.
2. an example of a cell is a ______ cell.
3. a tissue is made of a group of similar ______ working together.
4. an example of a tissue is ______ tissue.
5. an organ is made of different ______ working together to do a special job.
6. an example of an organ is the ______.
7. an organ system is made of many ______ working together to do a special job.
8. an example of an organ system is the ______ system.
9. an ______ is a living thing that carries out its own life activities.
10. an example of an organism is ______.

challenges:
the largest organ in the human body is the ____ because ____
human skin is an example of an ______

Explanation:

These questions relate to the biological hierarchy of organization in living things, from the smallest unit (cell) to the entire organism. Examples are based on common biological structures.

Answer:

1. cell
2. blood (or muscle, nerve, etc.)
3. cells
4. muscle (or epithelial, connective, etc.)
5. tissues
6. stomach (or heart, lung, etc.)
7. organs
8. digestive (or respiratory, circulatory, etc.)
9. organism
10. human (or dog, tree, etc.)

Challenges:
The largest organ in the human body is the skin.
Human skin is an example of an organ because it is made of multiple tissues (epithelial, connective, nervous) working together to perform functions like protection and temperature regulation.