Answer:
The celestial poles are imaginary lines that trace the Earth's rotation axis in space. ... Because of this, constellations and stars close to the celestial poles, such as the Big Dipper, can be used to estimate time during the night.
Explanation:
Changes in the trilobite exoskeleton can be attributed to changing environments and competition for survival
electron = negative charge (I remember this one is negative because it is not the other two )
proton = positive charge (aka "P" is for "Positive")
neutron = no charge (aka "N" is for "No charge")
Hope this helps!