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IgA antibodies protect body surfaces exposed to outside foreign substances. IgG antibodies are found in all body fluids. IgM antibodies are the first type of antibody made in response to an infection. IgE antibody levels are often high in people with allergies. IgD antibodies are found in tissues lining the abdomen and chest.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
![Comparing allele and genotype frequencies in a population with the Hardy-Weinberg equation and a Pun](https://biology-forums.com/gallery/47/medium_33_12_07_11_4_10_53.jpeg)
![During their annual migration, the entire population of Arctic terns move from the Arctic Ocean in t](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_37_27_1802877.jpeg)