Does sound (longitudinal wave) travel very slowly in a vacuum? why?

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

How does friction with the atmosphere affect the speed of an artificial satellite

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.