Gravity pulled materials together forming the planets in our solar system. The inner planets consist of dense material, such as iron, which was pulled to the center of the
planets. Materials such as ice, liquid and gas formed the outer planets. Scientist
identify this process as:
Planetary Arrangement
Solar System Systematic Development
Planet Differentiation
Heavy Metal Gaseous Planetary Design
^ K12

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Choose an equation that represents an enzyme-catalyzed reaction. (a) enzyme + substrate → enzyme-substrate complex (b) enzyme + substrate ←−→ enzyme + products (c) enzyme + substrate ←−→ enzyme-substrate complex → enzyme + products (d) enzyme + substrate ←−→ enzyme-substrate complex → enzyme-substrate complex + products

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?