You just need to count the number of crest (high points) if waves that like pass the fixed point 1 second or some other time period. The higher the number is man, the greater the frequency is, Hope this helps!
They fall under Archaea and Bacteria.
The greenhouse effect is a naturally occurring process that aids in heating the Earth's surface and atmosphere. It results from the fact that certain atmospheric gases, such as carbon dioxide, water vapor, and methane, are able to change the energy balance of the planet by absorbing longwave radiation emitted from the Earth's surface. Without the greenhouse effect life on this planet would probably not exist as the average temperature of the Earth would be a chilly -18° Celsius, rather than the present 15° Celsius.
Answer:
External respiration is the exchange of gases with the external environment, and occurs in the alveoli of the lungs.
