Blood Blood is a fluid which circulates in a closed system of blood vessels, in multicellular and highly complex vertebrate animals. Blood consists of a pale yellow fluid called plasma and solid elements such as red blood cells (erythrocytes) while blood cells (leucocytes) and platelets (thrombocytes). Composition Blood contains 55% of the plasma and 45% … Read more Blood


Diversity in living organisms There is a great diversity among living organisms found on the planet earth. They differ in their structure, habit, habitat, mode of nutrition, and physiology. The Biodiversity of the earth is enormous. Current estimates suggest that the earth may have anywhere from 10 to over 40 million species of organisms, but … Read more Systematics

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