What can be seen with unaided eyes or with a microscope.

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

The boiling point of propanoic acid is higher than that of 1-butanol because: propanoic acid has a higher molecular weight than 1-butanol. propanoic acid is more soluble in water than 1-butanol. propanoic acid is a better hydrogen bond donor than 1-butanol. propanoic acid forms hydrogen bonded dimers and 1-butanol does not. 1-butanol forms hydrogen bonded dimers and propanoic acid does not.

1. list three scientific reasons cockroaches may fly.