Answer: Minerals range in composition from pure elements and simple salts to very complex silicates with thousands of known forms. The study of minerals is called mineralogy. To be classified as a "true" mineral, a substance must be a solid and have a crystal structure.
Exoskeleton
Exoskeleton is a evolutionary innovation. This is operated by muscles attached to it and acts as an armor. Other than support this is an adaptive mechanism to provide protection against predators. In vertebrates, it is considered as the dermal bone that developed via membranous ossification. Fishes retained their exoskeleton in the form of their scales. However, in some organisms terrestrial evolution allows the loss of exoskeleton and formed a more mobile endoskeleton,
Omnivores and carnivores are related because omnivores also eat meat and carnivores eat strictly meat. For example, a t-rex is a carnivore and a omnivore is those rhino looking dinosaurs.
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