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any three from: no cell wall in animal cells/ (cellulose) cell wall in plant cell centrioles present in animal cell, not in present in plant cell (permanent) vacuole in plant cell, lack of (permanent) vac...

The way a simple virus invades a cell is with double stranded DNA replication. The virus has a coat of protein covering the DNA, once bound to the side of the cell the virus releases the DNA where it is t...

The function is to move the respiratory medium (air or water) over the respiratory surface; to maintain the concentration gradient. In mammals, the diaphragm and the intercostal muscles are responsible fo...

Aerobic respiration is the process by which energy is released from glucose in the presence of oxygen (as indicated by the word 'aerobic'). While in reality it is a complex, multi-step series of reactions...

Pathogen: any microorganism (bacteria or virus) that can cause disease. anything that has a 'path' to disease.

 I will explain that often the question gives a clue to the answer to the question. Th...