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This question comes up often in GCSE papers and is a key topic when talking about exchange or cell biology. 
Active transport comes hand in hand with diffusion and osmosis. It is a key mechanism for ...

Ionic bonding occurs between metallic and non-metallic atoms. Electrons are transferred from metal atoms to non-metal atoms. This results in positively charged metal ions and negatively charged non-metal ...

In spermatogenesis, germline epithelium in the seminiferous tubules of the testes divides by mitosis and then a period of cell growth occurs, changing them from spermatogonia to primary spermatocytes. The...

Broadly speaking, the main function of the kidneys is to filter out waste from the body and excrete it out in the urine. Excretion is the removal of waste (i.e. products of metabolism/ toxic products like...

15⁰ = 1 Anything to the power of 0 is always 1. See the examples below: 10⁰ = 1; 25⁰ = 1; 50⁰ = 1.