A.) Veins in the pulmonary circuit carry oxygen-rich blood
red blood cells are used to circulate oxygen through out the body, thus it is true.
Enzyme- they are also known as natural catalysts.
<em>It involves making observations, formulating a hypothesis, and conducting scientific experiments. Scientific inquiry starts with an observation followed by the formulation of a question about what has been observed.</em>
<em>Hope this helps</em>
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<em>Please give me brainliest</em>
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<em>Thank you for letting me answer your question </em>
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<em>Thank you,</em>
<em>Florida Mermaid</em>
