Answer: a. Have an overall neutral charge
b. Have electrons that are not equally shared
d. Have slight positive and negative ends
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
A polar covalent bond is defined as the bond which is formed when there is a difference of electronegativities between the atoms. Example: 
The more electronegative element i.e. chlorine acquires a partial negative charge as it withdraws the electron density towards itself. Thus hydrogen acquires a partial positive charge. The opposite charges cancel each other and thus overall it is electrically neutral.
Answer: you are using kinetic or "sliding" friction
This would be true.
The reason why this answer would be true is because a fossil's position in the rock layers determine how long they died and were preserved. If the fossils were right next to each other, then that means both organisms were preserved at the same time.
Answer:
I believe your answer would be grams.