When a plant performs photosynthesis the radiant energy of the sun is..
-
a: released in the atmosphere
b: used up in the process
c: transported into the soil through the roots
d: stored as chemical energy

During convection, less dense fluid rises and denser fluid sinks.

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

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