It is a double-membrane structure in which the outer membrane is more permeable than inner membrane. The inner membrane possesses more proteins. The outer membrane may be attached to ER. They are present in the cytoplasm of green algae and higher plants. Based on the given information, answer the given questions
Mention its three parts

Explanation

To answer the question regarding the three parts of the double-membrane structure described, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The structure described in the question is a chloroplast, which is found in the cytoplasm of green algae and higher plants.

2. **Recognize the Double Membrane**: Chloroplasts have an outer and an inner membrane. The outer membrane is more permeable, while the inner membrane contains more proteins.

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