Question 1
After energy flows into a food web, it leaves mainly by
◦ losses of metabolic heat.
◦ evaporation.
◦ conversion to chemical energy.
◦ waste production.
◦ convection.
Question 2
All living organisms are dependent upon plants because
◦ plants produce carbon dioxide as a by-product of photosynthesis.
◦ as producers, they form the base of food chains.
◦ they function to prevent erosion and reduce desertification.
◦ they remove oxygen from the atmosphere.
◦ they contribute to the problems generated by the greenhouse effect.