Which of the following are true about the interactions between or among the integumentary, muscular, and skeletal systems of the human body?
i. the skin of the integumentary system protects the muscles of the muscular system and the bones of the skeletal system from the outside environment.

ii. the muscles of the muscular system contract or relax to move the bones of the skeletal system.

iii. the bones of the skeletal system and the skin of the integumentary system work together to provide protection for the human body.

Subduction zones form when an oceanic plate collides with another oceanic plate or continental plate. the continental crust is lighter and less dense than oceanic crust. continental crust's density is approximately 2.7 grams per cubic centimeter. oceanic crust is thinner and the average density is about 3.3 cubic centimeters. when the two crustal plates converge the oceanic plate always bends and subducts beneath a continental plate. once the oceanic crust subjects, the rocks are subjected to changes in heat and pressure. because of this, we would expect to find rocks in the area of a subduction. a) clastic b) igneous c) metamorphic d) sedimentary

If a keystone species is removed from an ecosystem

which is an effect of short-term environmental changes? a) adaptation b) speciation c) extinction d) death (5 points)