Which of the following is a communicable disease?InfluenzaLung cancerDiabetesCardiovascular disease2What is the biological effect of carbon monoxide (inhaled by smoking) on the body?It binds to haemoglobin more readily than oxygen binds to haemoglobinIt causes scar tissue in the liverIt produces stress hormonesIt causes fatty deposits in the blood vessels3Why is a high-salt diet a risk factor for cardiovascular disease?Salt can cause obesitySalt can increase the production of stress hormonesSalt can cause high blood pressureSalt can cause fatty deposits in the blood vessels4Which of the following is a risk factor for cirrhosis of the liver?Poor dietAlcohol consumptionSmokingLack of exercise

The communicable disease among the options given is Influenza. Communicable diseases are those that can be transmitted from one person to another, and Influenza, also known as the flu, is a highly contagious viral infection.

The biological effect of carbon monoxide (inhaled by smoking) on the body is that it binds to haemoglobin more readily than oxygen binds to haemoglobin. This means that when you inhale carbon monoxide, it takes the place of oxygen in your blood, depriving your organs and tissues of the oxygen they need to function properly.

A high-salt diet is a risk factor for cardiovascular disease because salt can cause high blood pressure. High blood pressure is a major risk factor for heart disease as it puts extra strain on your heart and blood vessels, which can over time lead to their weakening and damage, increasing the risk of cardiovascular disease.

Among the options given, alcohol consumption is a risk factor for cirrhosis of the liver. Cirrhosis is a late stage of scarring (fibrosis) of the liver caused by many forms of liver diseases and conditions, such as hepatitis and chronic alcoholism.