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Module 1: Ciclo de vida

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Adaptaciones reproductivas

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XSIQ
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Biology - Reproductive adaptations

Reproductive adapations

* males and females form a permanent association

* some are hermaphrodite

* body segments contain huge numbers of eggs that may break off and be
voided in the faeces

* large numbers of eggs and larvae are produced to increase the chance of
reaching or being reached by a host

* sexual and asexual stages take advantage of the conditions in the
particular host(s)

Many endoparasites of the gut have reduced systems - for example,
pre-digested food is available, therefore eliminating the need for a
digestive system. Normal sensory organs are unnecessary but a larval stage
may require these systems. Totally parasitic plants do not have
photosynthetic tissue, though partial parasites do, e.g. mistletoe.

View the video of earthworms. They are hermaphrodites (ie an individual
has both male and female sex organs). When they pair to copulate, both
worms donate and receive sperm.

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