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two bean-shaped guard cells surrounding a pore in the epidermis of a leaf that allow gases to enter and leave the leaf. The guard cells regulate the size of the pore in order to control the exchange of respiratory gases and the rate of transpiration.
the natural resistances with which a person is born. It occurs because of a body's genetic make-...
substances that have a harmful effect on the environment and also on human health.
an autoimmune disease which is treated with insulin injections.
potentially lethal disease in humans and grazing animals such as cows and sheep. The disease is...
the first part of the intestine, from the pyloric valve of the stomach to the caecum. It...