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1. Fertilisers are washed into waterways by rain or irrigation.

2. The increased availability of nutrients causes aquatic plant life to grow rapidly.

Some drugs need to be converted into other molecules so the body can use them effectively. This conversion is done by enzymes, which are protiens. Protiens are made up of amino acids, which are coded f...

Meiosis only takes place in the reproductive organs of plants and animals as opposed to throughout the body like mitosis. Meiosis results in the production of 4 genetically different, haploid gametes a...

Genes are sections of our DNA that have a specific genetic code.  When you're born you get a copy of each gene from your mother and a copy of each gene from your father.  These copies are called allele...

The main bonding in DNA which renders the double helix structure so stable is that of hydrogen bonds. Between the complementary base pairs, hydrogen bonds connect the two strands of the helix. There are 3...