A tissue is composed of a group of

1. Analyze the question The question asks about the level of biological organization. It wants to know what a tissue is made of.

2. Explain the concept Living things are organized in a hierarchy, from simplest to most complex:

Cell → Tissue → Organ → System → Organism

• Cell: the basic unit of life
• Tissue: a group of similar cells that work together to perform a particular function (e.g. muscle tissue, xylem, epithelial tissue)
• Organ: a group of different tissues working together (e.g. the heart, the leaf)
• System: a group of related organs working together (e.g. the digestive system)

3. Step-by-step solution

• Option B (tissues): a group of tissues forms an organ, so this is wrong.
• Option C (systems): systems are higher than tissues in the hierarchy, so this is wrong.
• Option D (related organs): a group of related organs forms a system, so this is wrong.
• Option A (similar cells): cells of the same kind, doing the same job, make up a tissue. This is correct.

4. Answer The correct option is A. similar cells.

5. Exam tip Remember the order with the phrase: "Cells Together Of Strength" (Cell, Tissue, Organ, System). Each level is built from the one before it. A tissue is made of similar cells, an organ of tissues, and a system of organs.

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