Nancy and esteban are working on a model of an ellipsoidal joint. which two pieces should they select for their model? i and ii iii and iv i and iii ii and iv

i and iii

Explanation:

The ellipsoidal joints are those that have one concave end in contact with another convex, limiting movement. Because of this format, we can say that the best models for Nancy and Esteban to use are the "i" and "iii" models.

Importantly, these joints allow for flexion, extension, abduction, and adduction, but not rotation.

the plates spread at mid-ocean ridges (they are divergent plate boundaries) which allows magma to rise through the weakness between the plates. the magma then emerges as lava from the boundary and cools, creating a new crust.

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