<span>The Periosteum is the membrane that covers a bone.Generally Periosteum is a thick layer of vascular connective tissue concealing the bones with the exception of at the surfaces of the joints. Periosteum acts like the skin of the bones.Periosteum plays an important role in bone growth and maintenance.</span>
Chlorophyll is the pigment responsible for photosynthesis
Plants are classified in domain eukarya plantae
They produce toxins that make them poisonous. The sponge will produce toxins that could disrupt the metabolism of any organisms that dare to consume them. Most predators will be able to detect this toxin through their sense of smells which make them rather to avoid the sponge.
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Many fossil records are incomplete because some animals were soft bodied or soft tissue which decays quickly. Also, due to movement of tectonic plates, fossils are destroyed so there are many new fossilised organisms which are destroyed and we don't know about them
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