Mike is studying for his zoology class. Today, he is studying about reptiles and amphibians. He found it easy to understand their differences by categorizing them. For that, he classified reptiles as class A and amphibians as class B.  Given the paragraph above, please answer correctly the following question:   Which class of animals would have weaker separation of  oxygenated and deoxygenated bloodstreams, class A or class B?

class B