<em><u>PLATO ANSWER:</u></em><em> </em>A and C
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C.
It is d, becuase you divide 500 by 15, and that is the closest answer
I think the respiratory system and circulatory system
Answer:
Active transport is the movement of particles from an area of low concentration to an area of high concentration using a force.
The First 20 Elements and The Difference Between Elements, Compounds and Mixtures. Standard. 1 – H – Hydrogen – Odorless, Colorless and Flammable Gas. 2 – He – Helium – Colorless and Odorless. 3 – Li – Lithium – Low Melting Point and Low Density. 4 – Be – Beryllium – High Thermal Conductivity and Non Magnetic.