Question

Why is it that dogs always produce several puppies whereas humans beings usally produce only one child at a time

Answer 1

well from one zygote dogs have the capability to reproduce many babies
the zygote divides from the morula stageb itself
for humans the cluster of cells kr at morulla stage is of only one baby
but octoplets are even an exception

Answer 2

dogs produce more than one egg at a time Hence more puppies are born to them at the same time where as humans usually produce one egg at a time has produced only one child at a time
hope it will help you
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