Environmental Science
Which one is true?

symbiosis when the interaction is useful to both the populations
commensalism when the interaction is useful to both the populations
symbiosis when neither population affects each other
commensalism when none of the interacting populations affect each other

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

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

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