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The reduction in plant chlorophyll content due to TMV means that less photosynthesis is reduced. Chlorophyll is integral to photosynthesis. A reduction in photosynthesis means that there is a subsequent r...

These animals are more likely to pass on (recessive) disorders, and subsequently more likely to be susceptible to diseases.  

Immunisation is the process of becoming "immune" to a pathogen, in other words once you are exposed to the pathogen again you won't become ill (present with the symptoms). After your body is exp...

The process begins when excess fertiliser, which has been used for farming, is flushed into rivers or lakes by rainwater. The fertiliser then provides nutrients such as nitrates which allow plant life in ...

A hormone is a chemical messenger which travels in the blood.  Hormones cause other tissues and organs to either produce other hormones or carry out chemical reactions. Water-soluble hormones cause this b...