'Malthus theory" is based on following facts:

1. The means of subsistence (mean of supporting life, like food) grows only arithmetically while unchecked population grows geometrically.

2. The rapid growth of population creates imbalances with the environment.

3. The imbalances at higher degree causes malnutrition, hunger, spread of diseases, droughts, war, etc. which ultimately reduce the population up to the level of the availability of substituent ( food etc).

The factors affecting population are:

1. Natality- It is the expressed as the number of births per 1000 individuals per year.

2. Mortality- It is the average number of individuals that die per 1000 persons in a population per year.

3. Immigration- Entry of migrants into a country from other with intention of settling is immigration.

4. Emigration- Going out into other country for settlement is called emigration.

5. Environmental factors include availability of food, habitat, natural calamity such...

The differences between 'J' shaped curve and 'S' shaped curve are:

The causes of drug abuse are:
1. Curiosity

2. Peer group pressure

3. Excitement

4. Persistent use to get relief from pain

5. Family history of consumption of drugs

6. To overcome frustration and depression

7. Desire to do more physical or mental work.

A Heart attack, also called a myocardial infarction(MI), occurs when the blood supply to a part of the heart is blocked.

Medications of heart attack

1. Use of aspirin

2. Use of thrombolytics

3. Nitroglycerin- used to treat chest pain , can help improve blood flow to the heart by widening(dilating) of the blood vessels.

4. Beta blockers- helps to relax heart muscles, slow your heart beat and decrease blood pressure.

Surgical Procedures:

1. Coronary angioplasty and stenting

2. Coronary artery bypass...