Agricultural chemicals is an example of a nonpit source of freshwater pollution
The bones in your arm are a structure that first appeared in lobe fin fishes, such as the Eusthenopteron fish.
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:)
If you have type A blood then you must have at least one copy of the A allele. However, you could also have two copies of the A allele within type A blood. The genotype, therefore, would be either AO (if they have 1 A allele) or AA (if they have 2 A alleles).
The answer to your question is Dehydration synthesis