The two statements I and II are regarding cell theory . Identify the statements that were given by which of the following scientists ?
I. The bodies of animals and plants are composed of cells and products of cells .
II. All cells from pre - existing cells.

Options

A. `{:(I,II),("Schleiden and Schwann","Rudolf Vichow"):}`
B. `{:(I,II),("Rudolf Vichow","Schleiden and Schwann"):}`
C. `{:(I,II),("Robert Brown ","Schleiden and Schwann"):}`
D. `{:(I,II),("Robert Brown ","Robert Hooke"):}`

Answer

To solve the question regarding the statements related to cell theory, we can break it down into the following steps:

### Step 1: Analyze Statement I
The first statement is: "The bodies of animals and plants are composed of cells and products of cells."

- This statement reflects the fundamental concept of cell theory, which states that all living organisms are made up of cells.
- The scientists who are credited with this part of the cell theory are **Matthias Schleiden** (who studied plant cells) and **Theodor Schwann** (who studied animal cells). Together, they formulated the idea that all living things are composed of cells.

### Step 2: Analyze Statement II
The second statement is: "All cells arise from pre-existing cells."

- This statement is a key principle of cell theory, indicating that new cells are formed from the division of existing cells.
- The scientist associated with this statement is **Rudolf Virchow**, who proposed that all cells come from pre-existing cells in 1855.

### Step 3: Conclusion
Based on the analysis:
- Statement I is attributed to **Schleiden and Schwann**.
- Statement II is attributed to **Rudolf Virchow**.

Thus, the correct scientists for the statements are:
- I: Schleiden and Schwann
- II: Rudolf Virchow

### Final Answer
The correct option is:
- I: Schleiden and Schwann
- II: Rudolf Virchow

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