The <span>principal ways in which a load may be applied to a specimen are:
1. Tension
2. Compression
3. Shear
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The force
that pulls material apart is tension and the one that squashes
material together is compression and shear is the action of the force in
trying to cut through the material.
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The Precambrian is the earliest era. It is followed by the Paleozoic, when multi-cellular life first flourished on earth After that came the Mesozoic - 'middle life' - the era before the current one which is the Cenozoic. Note that the Paleozoic, Mesozoic and Cenozoic are all part of the Phanerozoic Eon.
<span>The protocell's fatty acid membrane allows chemical compounds, including the building blocks of DNA, to enter into the cell without the assistance of the protein channels and pumps required by today's highly developed cell membranes</span>
1. E: Photosynthesis; D: cellular respiration
2. all Eukaryotic cells
3. cellular respiration does not consume carbon dioxide
4. the 200 calorie food contains less potential energy than the 300 calorie food