Vectors can be defined as:

Identify the diseases caused by protozoans:

State whether the following statement is true or false:
Chronic diseases have very drastic long-term effects on people's health as compared to acute diseases.

Given below are a few situations:
$(i)$ Geeta of Class $IX$ was having a common cold. She sits with Sarika,who also develops the disease.
$(ii)$ Animesh of Class $IX$ shifted to a new residence with his family where a water purification system has not been installed yet. He develops Cholera and Dysentery.

How are signs of a disease different from symptoms of a disease?

Name any three diseases transmitted through vectors.