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shivering - muscles contract rapidly, causes more respiration which releases energy blood vessels near skin constrict - blood flow to skin decreases, less energy lost to surroundings

The first thing to remember is that muscles always act in pairs; so when one contracts, the other relaxes. Think of the muscles in your arm; when you bend your arm towards you, the bicep contracts so beco...

Osmosis can be explained as the passing of water molecules across a partially permeable membrane from an area of high concentration of water molecules to an area of low concentration of water molecules.If...

Eukaryotic cells are what make up you (and also plants), whereas prokaryotic cells make up bacteria. If you think about the fact that bacteria are way smaller than plants and animals, you can remem...

Due to natural variation due to mutations in their DNA, some giraffes in the population had longer necks. These longer necks enabled them to reach leaves higher up on the trees, which secured them a good ...