Do the structures in an organism relate to their functions?

Which line in the graph above best illustrates an effect of the carbon dioxide level in the blood on breathing rate before, during and after a period of exercise? 1.b,2.c,3.a,4.d

What are the methods of heat transfer? check all that apply. absorption conduction convection radiation reflection

Which of the following changes between trophic levels would have the highest energy conversion efficiency? a) producer to primary consumer b) primary consumer to secondary consumer c) secondary consumer to tertiary consumer d) none of the above