The Big Bang Theory allows scientists to extrapolate back in time and conclude that the universe __. Select all that apply. was cooler and less dense in the past
consisted of one star with eight orbiting planets
was hotter and denser in the past
o consisted primarily of carbon and oxygen in the past
O emerged from a very tiny region and expanded
o consisted primarily of iron and nickel in the past

In which of the following relationships is one organism always benefited while the other organism is always harmed

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.