Answer: the antigens identify the foreign invader
While you didn't provide any following sources, healthy sources of energy for humans are usually considered to be different types of fruits and vegetables, lean meats, wholewheat grains, nuts, seeds, and healthy oils. All these constitute a healthy human diet and are a healthy source of energy.
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Answer:
Blood gasses are normal. Agonal breathing is characterized by slow, very shallow irregular respirations that result from anoxic brain injury. This will often progress to apnea depending on the underlying cause. Apnea is the absence of breathing.
The answer would be A. It is a because diffusion and osmosis pass through cell membranes not using any energy, making it passive transport. They differ since diffusion is in all molecules but water and osmosis is just water molecules