Give reasons: Blood of mother never mixes up with that of foetus. Yet it nourishes the foetus.

Explanation

To answer the question, "Give reasons: Blood of mother never mixes up with that of foetus. Yet it nourishes the foetus," we can break down the explanation into several key points:

### Step-by-Step Solution:

1. **Placenta Formation**:
- The placenta is an organ that forms during pregnancy and connects the developing fetus to the uterine wall of the mother. It facilitates the exchange of nutrients, gases, and waste products between the mother and the fetus.

2. **Separate Circulatory Systems**:
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