What is the source of energy in most ecosystems

Biomass can be used to generate electricity. biomass relies heavily on agricultural crops. plants release carbon dioxide and water in combustion. plants use photosynthesis to originally generate the energy that is needed. the chemical energy of these plants all started with what energy source?

What percentage of light hits earth's surface directly?

Beth’s hygrometer is reading a temperature of 30 c and a relative humidity of 65%. the humidity in the air is?