The brain recognizes action potentials from different sensory modalities as separate and distinct because a. action potentials from different sensory modalities are carried on different nerve tracts. b. the volley of action potentials differs for each sensory modality. c. action potentials from different sensory modalities utilize different neurotransmitter systems. d. action potentials from different sensory modaliti

Action potentials from different sensory modalities are carried on different nerve tracts.

Explanation:

Action potential in the cells occur upon the stimulation of the signal. The action potential results in the change in the membrane potential of the cell and responsible for the transmission of nerve impulse.

Different sensory receptors are present on brain to sense the different action potentials of the body. The different sensory modalities are used for the different nerve tracts and information flows occur in the body in the specific area.

Thus, the correct option is (a).

white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

the answer is:

carbon dioxide