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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.
Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
![A plot of trophic diversity across the major groups of organisms shows highest trophic diversity amo](https://biology-forums.com/gallery/47/medium_33_09_09_11_10_15_38_17201332.jpeg)
![(a) Yucca baccata in full flower; (b) a Yucca moth, Tegeticula planella, ovipositing on a Yucca flow](https://biology-forums.com/gallery/47/medium_33_17_02_12_5_40_33_1984551.jpeg)