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The process of Biological nitrogen fixation are catalysed by enzymes called nitrogenases These enzymes contain iron , often with a second metal, usually molybdenum .
The plant cell wall is primarily composed of what?
What is the primary function of the lymphatic system?
Which of the following is not an example of asexual reproduction?
Match the following placental mammals with their marsupial counterparts:
The yellow color of human urine is due to:
The size of VNTR varies from :
Animals that lack a body cavity are known as:
The presence of which bacteria is an indicator of water pollution?
