Which of the following is a true statement? A Periods form horizontal rows; groups form vertical columns
B Groups form horizontal rows; periods form vertical columns
C Categories form horizontal rows; gases form vertical columns
D Gases form horizontal rows; categories form vertical columns

What is the process of pulling apart an n2 molecule nevermind i got it

The equation shows cellular respiration. during cellular respiration, glucose combines with oxygen to form carbon dioxide, water, and atp. what happens to the energy in the bonds in glucose? the energy is transferred to oxygen. the energy is transferred to carbon dioxide. the energy is transferred to water. the energy is transferred to atp.

Which of the following is a reason why early living organisms on earth could not have survived on the surface? 1. the lack of an ozone layer 2. the lack of oxygen in the atmosphere 3. the fact that these organisms were single-celled