Вопрос № 236617 - Английский язык

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Blood cells are of three kinds: red blood cells (erythrocytes), white blood cells (leukocytes and lymphocytes), and blood platelets.
Red blood cells are approximately round, disk-shaped with high edges. They measure approximately 1/3,000 of an inch in diameter. The healthy male has about 5 million red blood cells per cubic millimeter of blood. A healthy woman has about 10% fewer.
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In humans, mature red blood cells are …

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Red blood cells are destroyed and replaced at a rate of about 1% a day. These cells are formed in the bone marrow, particularly in the spine and hip bones, the ribs and breast-bone. They are destroyed largely in the spleen.
Blood platelets are about 1/3 as large as red blood cells. They are concerned with blood clotting.
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Red blood cells begin their existence in …

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Defective teeth are the sign of allergic reactions.

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Some diseases cause an anima’s death.

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The research of genetic diseases is used animals as models.

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Competition is one of the key elements of any habitat.