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Vaccines are made of dead or inactive pathogens. White blood cells in the body come into contact with the pathogen and produce antibodies which destroy the pathogen. The body produces memory cells which m...

I've foung the best way to structure an introduction is to use the (upside down) pyramid method. You open with a broad statement that links to the general topic you'll be covering, followed by a more poin...

So to mention anything about hydrocarbons, you first have to find the longest chain of carbons in the molecule! It doesn't have to be straight - it can be bent, or turn in a circle or anything like that! ...

To be successful and effective when carrying out a primary source analysis, you must first understand what a primary source actually is. In historic or literary terms, a primary source is a document or im...

Natural selection describes the selective pressure favouring those species with certain phenotypes (characteristics) which make them better suited to the environment than other species. Those with favoura...