Explanation

Protists are a group of all the eukaryotes that are not fungi, animals, or plants

Explanation

Angina pectoris is the medical term for chest pain or discomfort due to coronary heart disease.

It occurs when the heart muscle doesn't get as much blood as it needs.

This usually happens because one or more of the heart's arteries is narrowed or blocked, also called ischemia

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Explanation

 II only

Explanation

Robert Hook described the cell as: Basic unit of life

Robert Hook  discovered cells: 1665

Cell is the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body

Explanation

Fluoride Pollution has negative effects on the joints, bones and causes fluorosis in the teeth.

Explanation

The human ear responds to frequencies in the range of 20 Hz to 20,000 Hz (20 kHz),18 although most speech frequencies lie between 100 and 4,000 Hz.

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The lungs are located on either side of the breastbone in the chest cavity 

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The effects of the thyroid come from two iodine containing-hormones

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