______ of species is a reflection of their evolutionary relationships.
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Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
Equinox occurs when the sun is vertically above .....
Equus Caballus is the scientific name of _________.
Growing agricultural crops between rows of planted trees is known as
The outermost layer of sun is called
The maintenance functions of living organisms are performed by the _____.
What is the process of waste water treatment is commonly known?