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allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and watery eyes.
barrier made of coral (a living organism consisting of animal and algal tissues) that lies in...
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
gaps (about 1 micrometre long) that occur between the myelin sheaths generated by consecutive...
outgrowths of neurons (nerve cells) that transmit nerve impulses towards the cell body.
the digestive tract of an animal, made up of different organs, that extends from the mouth to...