Which is a characteristic of all ions? O They are metals.
O They have a charge.
They are made of two or more types of atoms.
O They form chemical bonds through electron sharing.

Which statement accurately describes the relationship between air pressure, air density, or altitude? as altitude increases, pressure increases.as altitude increases, air density increases.air pressure and density are lowest at sea level.denser air exerts more pressure than less dense air.

Select all the correct answers.which compounds have the empirical formula ch20? (multiple answers)a.c2h4o2b.c3h603c.ch2o2d.c5h1005e.c6h1206

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse