Tutor profile: Miah S.
Subject: Earth Science
Do oceans freeze?
If the temperature is cold enough, ocean water does freeze. The polar ice cap at Earth's the North Pole is a giant chunk of frozen ocean water. Over cold regions such as Antarctica, Greenland, and Canada, the freshwater in the air freezes to snow and falls onto the land without a melting season to get rid of it. Over time, this snow builds up and compacts into an ice mass known as a glacier. Gravity slowly pulls the glacier downhill until it reaches out onto the ocean, forming an ice shelf. The ocean-bound edge of the ice shelf slowly crumbles into icebergs which float off on their own path. For this reason, glaciers, ice shelves, and icebergs are all thick sheets of frozen freshwater and not frozen ocean water.
Does every cell in our body contain DNA? Moreover, what exactly is DNA?
Not every cell in the human body contains DNA bundled in a cell nucleus. Specifically, mature red blood cells and cornified cells in the skin, hair, and nails contain no nucleus. However, all red blood cells, including humans, must start with DNA, as DNA contains the code that tells each cell how to construct itself in the first place. DNA is a molecule that contains the biological instructions that make each species unique.
Of the 11 main systems in the human body, which one influences the function of the body using hormones?
Of the 11 main systems in the human body, the endocrine system influences the function of the body using hormones.
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