- Life Sciences
allergic reaction to certain allergens such as pollen. It causes sneezing, a runny nose and watery eyes.
extremely hard, calcium-rich substance which covers the crown of the tooth.
animals that have a true coelom, which is a fluid-filled body cavity completely lined with...
the process whereby substances dissolved in the blood (such as H+ ions, nitrogenous waste and...
a biological membrane that separates the interior of all cells from the outside environment.