Platelets would help the blood clot, therefore preventing blood loss. White Blood Cells would help protect against infection. So, I believe the answer would be platelets & white blood cells.
Divergent boundaries occur where tectonic plates are moving away from each other. Mid ocean ridges are, as the name suggests on the floor of the ocean. Some divergent boundaries can be found on land. One example is in Iceland where the Mid-Atlantic Ridge surfaces. This region represents the area where the North American Plate is moving away from the Eurasian plate. Another example can be found in Africa along the East African Rift Valley.
Basically because they either have beating hearts, organs, skeletons, and more that plants and other things do not
