Answer:
prostaglandins
Explanation:
Prostaglandins are eicosanoids (i.e. lipids) derived from arachidonic acid and related fatty acids. Prostaglandins are synthesized by many tissues in the body when they are damaged or infected in order to deal with such injuries/infections. They are hormone-like compounds involved in pain and inflammation. It is well known that the levels of prostaglandins change in the menstrual cycle of women, producing vasoconstriction of the endometrial vessels during menstruation and contraction of the muscles in the myometrium. High prostaglandin levels are characteristic of severe menstrual cramps.
Answer:
See explanation section
Explanation:
Though The first Homo Sapiens were born about 200,000 years ago, the modern man left Africa 60,000 years ago to penetrate every corner of the world. It is hard to find that the distance and time of their travel. According to the anthropologist and paleontologist, the human took nearly six hundred generations to leave their African homeland to settle the world. It is also known as ‘’The great human migration’’.
Here is the source: The Genographic Project, National Geographic Smithsonian Magazine, University of Oxford.
Answer:
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Explanation:
1. Amphibians can breathe through their skin while humans cannot.
2.Frogs and other amphibians respire by alternatively dilating and contracting the buccopharyngeal cavity, while humans cannot
3.Some Amphibians such as, the larval amphibians respire in water, while it isn't possible for humans to do such
4.Humans only have one form of respiration, while Amphibians have multiple.
5.The lungs of amphibians are simple saclike structures that internally lack the complex spongy appearance of the lungs of birds, mammals, and humans
A farm because you have to water the plants and crops and give animals water
