Chorionic villus sampling technique is more advance than amniocentesis. Why?

Explanation

### Step-by-Step Solution:

1. **Definition of Techniques**:
- Chorionic Villus Sampling (CVS) and Amniocentesis are both diagnostic procedures used during pregnancy to assess the health of the fetus and detect any genetic abnormalities.

2. **Understanding the Structures**:
- The chorion and amnion are membranes that surround the developing fetus. CVS involves sampling tissue from the chorion, while amniocentesis involves sampling amniotic fluid.

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