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

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

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Environmental Science
Which one is true?

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

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