When you ask for directions to a post office you are asking about A. cartography
O B. place
C. GPS
D. location

the correct answer is d.) many new life-forms appeared, including most of the known types of invertebrates. hope this

explanation:

since the crust is readily accessible, scientists have been able to perform hands-on experiments to determine its composition; studies on the more distant mantle and core have limited opportunities samples. so scientists also rely on analyses of seismic waves and gravity and as well as magnetic studies.