<span>The correct answer to this question D - The only changes listed which do not involve forming or breaking chemical bonds would be boiling and melting. Boiling and melting are physical changes rather than chemical changes, so no new products are formed.</span>
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When oxygen levels in the blood decrease, the respiratory center sends signals to the diaphragm to increase the rate at which it contracts and relaxes.
Explanation:
Answer:
"Lipids are an essential component of the cell membrane. The structure is typically made of a glycerol backbone, 2 fatty acid tails (hydrophobic), and a phosphate group (hydrophilic)."
Answer:
A clock used to wake you up in the morning
