The answer is IgA.
The immunoglobulin can occur as a monomer or dimer. The dimeric form is called secretory-IgA because it is also secreted by glands that
produce saliva, tears, sweat, and in the lumen
of the gastrointestinal tract. It is the most secreted Immunoglobulin.
C. spinal nerves
it is the answer to your question.
<span>B. precipitation</span><span>
The evaporation process uses the sun radiation or sun’s thermal energy for vaporization of a water from the land or soil to be water vapor then in the air. Transpiration on the other hand is the same with evaporation that involves water molecules to be vaporized into the air but it is located in the stoma of the plants. It is like evaporation within plants. This is actually to have homeostasis in plants and still part of the water cycle. </span>
D. Ecosystems are important in maintaining the good chain among all the organisms within it, which contributes to a high value of biodiversity
