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Demodexfolliculorum and Demodexbrevisare are parasitic mites that particularly favour the hair follicles of eyebrows and eyelashes and measure a mere fraction of a millimeter long. They crawl about your face in the dark to mate and then crawl into the pores to lay their eggs and die. Healthy adults have around one or two mites per square centimetre of facial skin, though people with the condition rosacea can have 10 times more. Demodex does not have an anus and therefore cannot get rid of its faeces. Instead, their abdomen gets bigger and bigger, and when the mite dies it decomposes and releases its faeces all at once into the pore.
Quick Review • What is Ecology? • Why study Ecology? • What are the levels of organization in the biosphere? • Describe the differences between biotic and abiotic factors.
Autotrophs – organism that is able to capture energy from sunlight or chemicals and use it to produce its own food from inorganic compounds • Primary Producer – the first producer of energy rich compounds that are later used by other organisms
Photosynthesis Did someone say “photosynthesis”?!? • Captures light energy and uses it to power chemical reactions that convert carbon dioxide and water into oxygen and carbohydrates
Chemosynthesis – process in which chemical energy is used to produce carbohydrates
Heterotroph– Organism that obtains energy from other organisms
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