How did Wegener contribute to the Theory of Plate Tectonics? Wegener proposed that all continents were connected to form one large continent. Wegener proposed that a meteor hit Earth that caused plate tectonics to shift.
Wegener proposed that there has only been one supercontinent that existed.
Wegener proposed that Earth is only made of one large plate tectonic.

You exhale co2 which is produced during cellular respiration.  co2 combines with the water in your blood's plasma to make up one half of the body's most important buffer pair, carbonic acid.  the more physical activity you engage in, the more co2 your body is producing.  you can see this by putting some of the cabbage indicator in a glass and then blowing bubbles into it through a straw.  can you see a change in the color of the indicator?