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an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilise body temperature and pH, and to maintain homeostasis.
a complex chemical compound that fills the spaces in the cell wall between cellulose, ...
the second biological classification group (taxon) that is divided into phyla (for animals) or...
a molecule that is formed when oxygen and haemoglobin combine chemically.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
cone-shaped mammalian teeth used to grip and tear off pieces of meat.