The answer you are looking for is "<span>a. elements of ecosystems are mutually dependent on each other ".</span>
B & C in my opinion. If it asks for one— B. is what I would choose.
C! water vapor freezes into crystals
<span>Non-livings things do not exhibit any characteristics of life. They do not grow, respire, need energy, move, reproduce, evolve, or maintain homeostasis. </span><span>Living things are made of cells, obtain and use energy, grow and develop, reproduce, adapt and respond to their environment.</span>
