A banda de l’impacte d’objectes còsmics contra la Terra, cita altres causes que podrien provocar extincions massives com la descrita.

Describe the response the kidneys have to dehydration and excessive water intake. what happens to the concentration of urine in each case ?

Photosynthesis uses co2 and cellular respiration produces co2. we call the point when the two processes are in balance--when there is no net production of co2--the compensation point. how might you limit one of the processes in order to achieve a compensation point?

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.