The process of evapo-transpiration and precipitation is known as

Which of the following are the essential sources for releasing $CO_{2}$ into the atmosphere?
$I.$ Burning of wood
$II.$ Volcanic activity
$III.$ Combustion of organic matter
$IV.$ Fossil fuels
Choose the correct option.

Biogeochemical cycles can be traced in

Which of the following statements is incorrect?

Which of the following organisms convert plant matter into animal matter?

Solar energy is converted into chemical energy by plants,and this chemical energy is converted into kinetic or heat energy in animals. This process demonstrates: