They all have different compositions of protons, neutrons, and electrons. This causes variety and makes atoms different so they can make up different substances
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Hominids are bipedal and have big brains. They have several skeletal adaptations to walking upright, such as curved vertebrae and angled femurs. Hominids became omnivores and developing cooking, which helped make their teeth and jaws smaller. The handy man, Homo habilis lived around 2.33 to 1.44 million years ago.Feb 25, 2015
Link: https://study.com/academy/lesson/hominids-traits-diet-behavior.html
Note: This information is taken out of a website.
Enzymes are meant to break down food in the mouth making it easier to consume and the food and gather the nutrients inside
Sweating is the body's way of cooling itself. If you did not sweat, you could overheat the body and collapse from heat exhaustion.