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 two statements related to cell theory and identify the scientists who proposed them, we can follow these steps:

### Step 1: Analyze the First Statement
The first statement is: "The bodies of animals and plants are composed of cells and products of cells."
- This statement is a fundamental part of the cell theory, which states that all living organisms are made up of cells.

### Step 2: Identify the Scientist for the First Statement
- The first statement was proposed by **Matthias Schleiden** and **Theodor Schwann**. They are known for formulating the cell theory which includes the idea that all living things are composed of cells.

### Step 3: Analyze the Second Statement
The second statement is: "All cells arise from pre-existing cells."
- This statement emphasizes that new cells are formed from the division of existing cells.

### Step 4: Identify the Scientist for the Second Statement
- The second statement was proposed by **Rudolf Virchow** in 1855. He is known for stating that all cells come from pre-existing cells, which is a key principle in cell theory.

### Step 5: Conclusion
- Therefore, the first statement is attributed to **Schleiden and Schwann**, while the second statement is attributed to **Rudolf Virchow**.

### Final Answer
- **I. Schleiden and Schwann**
- **II. Rudolf Virchow**