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Animal and plant cells share many similarities. For example, they both have: a nucleus, which houses the genetic material; a cytoplasm, where the chemical reactions of the cell occur; a cell membrane, whi...
Diffusion is the passive (does not require energy input) movement of a substance down a concentration gradient from an area of high concentration to an a...
Speciation can be sympatric (both populations in the same place) or allopatric (populations in different places). Speciati...
Firstly I would discuss with the student what transpiration is and what xylem vessels are. Transpiration is the inevitable consequence of gas exchange in the leaf causing water to be transported through t...
The sino-atrial node depolarises which causes a wave of excitation to pass through the atria (right prior to left) before reaching the atrio-ventricular node. The wave of excitation causes systole of the ...
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