What is at the center of a red blood cell?
Plasma
Iron
Copper
Carbon
dioxide

Iron

Explanation:

hemoglobin: The iron-containing substance in RBCs that transports oxygen from the lungs to the rest of the body. It consists of a protein (globulin) and haem (a porphyrin ring with an atom of iron at its center).

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Iron!

Explanation:

There is haemoglobin, an iron complex in the middle of a red blood cell, which helps the red blood cell carry oxygen around the body!

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a. as the temperature increases, the kinetic energy of the gas molecules increases & the molecules move faster & further away from each other.

b. if you decrease the temperature of a fixed amount of gas at constant pressure, the combined gas law reduces to charles's law. in this case, volume will also decrease.

the answer is otpion c) understanding

he wants to be heard one more time. he wants to be understood. he needs the truth one more time.