The octet rule pertains to:
a. only the noble gases.
b. only groups 1a and 2a.
c. elements in groups 1a - 7a.
d. all elements in the periodic table.

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here

What human activity increases beach erosion?

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.