Mention two sources of`SO_(2)` in air.

Why is Taq polymerase preferred in PCR ? Mention the source of this enzyme.

To find out the concentration of SO_(2) in the air (in parts per million, i.e., ppm), the data was collected for 30 localities in a certain city Find the mean concentration of SO_(2) in the air.

Calculate the frequency of beats produced in air when two sources of sound are activated, one emitting a wavelength of 32 cm and the other of 32.2 cm. The speed of sound in air is 350 ms^-1 .

Mention two functions of human skin

Mention two types of competition

Name two sources of electricity.

Mention any two points of difference in the quality of inspired and expired air.