The heart is situated between the two lungs in the mediastinum.

The heart is a pear-shaped hollow organ.

The apex of the heart always rests on the diaphragm.

The heart develops from the ectoderm.

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The correct option is: D

The heart develops from the ectoderm.

The heart is a hollow muscular organ. It is encased within a double-walled membranous covering known as the pericardium. This pericardial sac plays a crucial role in protecting the heart from potential mechanical injuries.

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