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.  

a axis of a graph is a color or shade so we can all go outside and have a party so we can eat   some grilled cheese sammiches and broccoli and have some ugly fun times

i don't know why i put this, i know its not the i was just bored : p

delete this answer while you can

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.