Models are frequently used in science to assist in the understanding of complex information. Models can include items like a working volcano, an aquarium, or a stream table. What type of model are each of these items? A. two dimensional B. three dimensional C. mental explanation D. computer simulation

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

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explanation:

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the unequal cytoplasmic division that  results  in  one egg  and three polar bodies ensures that a fertilized  egg has  ample nutrients  forits journey  to  the uterus.