Iransi
9 l Nafees
He was a renowned biologist of 13" century A.D. He described the circulation of blood
in human body.
Levels of Blological Organization
Millions of organisms are present on the Earth. They are different from each other and
range from the simplest organisms i.e. bacteria to the most complex onesie. human
beings. The bodies of all living things are made of different parts organized in a certain
manner that supports life functions. This organisation includes atoms - molecules
organelles cells -tissues - organs - organ systems - organisms.
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