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the effect of the relative lengths of daylight and darkness on the physiology and behaviour of an organism.
the abiotic components relating to the physical nature of an area.
a ring of muscle that controls the passage of substances through a tube or body opening.
a hormone produced by the pituitary gland, which helps to limit the amount of water lost from...
the process whereby certain substances are removed from a liquid and others retained, due to...
large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...