Environmental Science
An association between two individuals or populations where both are benefitted and where neither can survive without the other is

protocoperation
commensalism
competition
mutualism

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Environmental Science
Which among the following is related to the word Mesoderm ?

Forms blood and bone (leads to complex internal organs)
Anatomically advanced animals having all three germ layers
Binomial system of classification
No membrane-bound organelles, no peptidoglycan in cell walls, introns

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