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IV 1. The bodies of cockroaches have three primary regions. These are the head, the thorax, and the abdomen. They possess three pairs of jointed legs, one pair of antennae, and a rigid exoskeleton.
2. A tendon is a tough fibrous connective tissue that connects muscle to bone. Tendons have many functions from passively modulating forces during locomotion to providing additional stability with no active work. The largest and the strongest tendon in the human body is the Achilles tendon.
Explanation:
3. Mammals, fish, reptiles, amphibians, and birds are examples of Vertebrates.Flatworms, arthropods, sponges, insects are a few examples of Invertebrates.
4. JOINT - A structure in the human or animal body at which two parts of the skeleton are fitted together.
5. X-rays (Roentgen-rays) were discovered on the 8th of November, 1895 by the German physicist Wilhelm Conrad Roentgen. Fifty days after the discovery of X-ray, on December 28, 1895.
6. Bone marrow makes more than 220 billion new blood cells every day. Most blood cells in the body develop from cells in the bone marrow.
7. LIGAMENT - A connective tissue that provides support to the organs and connects the bones together.