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A mutation arises in an individual that confers a selective advantage.  The phenotype the mutation produces is selected for by natural selection and so the individual survives to reproductive age.  This m...

The reaction between calcium carbonate and hydrochloric acid produces carbon dioxide.  The carbon dioxide could be collected in a gas syringe or in a measuring tube inverted and filled with water.  The ra...

Plant cells possess a membrane bound nucleus that acts as the control centre of a cell.  They also possess a vacuole which controls water balance in the cell.  The chloroplasts are the site of photosynthe...

Foreign cells that enter the body have antigens on the outside of them which will be complementary to a specific antibody. The antibody can bind to the antigen, forming an antigen-antibody complex, and th...

The romantic movemet was a cultural trend developed during the 18th century in Germany and then it spreaded all around Europe. It was based on the expression of the deep feeling of the author and his conn...