Earth is also known as _______.
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In stems, the protoxylem lies towards the centre and the metaxylem lies towards the periphery of the organ. This type of primary xylem is called _____________.
What does BOD5 refer to?
Which of the following trees shed their leaves once in a year?
Why does a black board appears black in colour?
The ozone layer is mainly found in the lower portion of the _______.
Mangifera indica is the scientific name of
The least preferred technique in the disposal of Municipal Solid Waste is