B. Is characterized by four different zones.
Producers, because according to food pyramid, only 10% of energy is passed onto the next layer, where the other 90 is passed off as heat, so there must be more producer in order to sustain the ecosystem.
<span>Physiology is studying the function of a certain body part.
</span><span>Anatomy is learning about the relationship between body parts. </span>
i think...
Theories are educated guests that are tested by experiments
It is regulated by a <span>metabolic rate b serum glucose levels</span>
