The ultimate source of energy (for most ecosystems) is the sun<span>. The ultimate fate of energy in ecosystems is for it to be lost as heat. Energy and nutrients are passed from organism to organism through the food chain as one organism eats another.</span>
a cell is the smallest structural and functional unit of an organism
Digestion starts in the mouth when you're chewing, then the stomach, then small intestines.
<span>Distance vs. Time Graph
x-axis (horizontal)= Time
y-axis (vertical)= Distance</span>
