Which model best summarizes the importance of solar energy for life on earth?
a. the electromagnetic spectrum
b. the carbon cycle
c. a food web
d. a mitochondrial matrix

The correct answer is option C, A food web

A food web represents the hierarchical order of feeding in a set of organisms with in a given ecosystem. It also represents the transfer of food energy from trophic level of food web to other trophic level. Basically if a food web if represented as a pyramid, the base position will be occupied the producers which trap the solar energy to produce food. At each trophic level 10% of the energy of its previous trophic level is retained while rest all is released. The entire food web is basically a web of energy and is very essential for the survival of the living beings with in an ecosystem.  

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

satellites are frequently used to make observations of the orbit on earth