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The freezing and boiling point of a substance changes as the air pressure around it changes. for example, at a lower air pressure (higher altitude) it is easier for water molecules to escape from liquid into the air. in a high altitude city such as denver, colorado compared to a sea-level city such as houston, texas, water

Positrons are spontaneously emitted from the nuclei of

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system