Who proposed the first lamellar model?

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the scientist who proposed the first lamellar model, which is also known as the sandwich model.

2. **Identifying the Model**: The lamellar model refers to the structure of the plasma membrane, which is described as a lipid bilayer. This model illustrates how lipids and proteins are arranged in the membrane.

3. **Recognizing the Key Features**: The lamellar model is characterized by a lipid bilayer, where lipid molecules have a hydrophilic (water-attracting) head and a hydrophobic (water-repelling) tail. This arrangement resembles a sandwich, with the lipid bilayer as the bread and the proteins as the filling.

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