Describe the role of calcium in maintaining human bones and teeth. Based on this, how do you think a lack of calcium may affect the shells of these birds?

How is it that a mutation in the Ptx1 can allow it to stop being active in the pelvic area, but not in the other tissues of stickleback fish? Group of answer choices A- The mutation is in the GENETIC SWITCH that turns ON/OFF the genes that lead to PRESENCE/ABSENCE only of pelvic fins.   B- The mutation is in the GENE that makes the materials that build only the pelvic fins.

anthropology question A femur exhibits a clean, round entrance wound to the popliteal surface that measures approximately one-quarter of an inch; however, there is no exit wound. what can be said of the power, size, and placement of the weapon causing wound? if there had been an exit wound, where would it have been located and what type of fracture lines would have radiated from it?

Explain how cats are able to jump from great heights without sustaining injuries. Do you think it is possible for humans to achieve such feats?