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Firsty, read the question carefully, making sure to underline any key points so that you understand exactly what the question is asking. Look at the marks awarded for the question, this should give you so...

The cell membrane is a semi-permeable structure that surrounds a cell and it is present in plant, animal and bacteria cells. It is semi-permeable because some substances such as glucose and water can pass...

Photosynthesis is an endothermic reaction- energy is added (endo-in, exo-exit)
H₂O + CO₂ ==> C₆H₁₂O₆ + O₂Photosynthesis is a proce...

The human heart is described as a double pump because blood passes through it and gets pumped out of it twice in a single circuit of the circulatory system. A normal heart is separated into two halves, ri...

It controls what enters and leaves the cell.