They developed to be protected by the hard shell from parasites and ther predators.
When cell division is not regulated it can cause a malignant rumour called cancer , radiation is used in chemotherapy to kill the cancer, tumoutsd can also be benign
12. The goal is meiosis is to reduce the number of chromosomes by half.
The answer is A.<span> A fuse opens an electric circuit when the current gets too high. When a circuit is open, a current is unable to flow through it.
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