Current thinking on how the Toxoplasma gondii parasite invades its host is incorrect, according to a study published today in Nature Methods describing a new technique to knock out genes. The findings could have implications ...
Definition. Coral bleaching is a process whereby the coral colonies lose their colour, either due to the loss of pigments by microscopic algae (zooxanthellae) living in symbiosis with their host organisms (polyps), or because these zooxanthellae have been expelled.
   Great: The Great Barrier Reef is a large and vast coral reef: at  2000km long, it is the largest coral reef in the world.   Barrier: The Great Barrier Reef is a barrier reef. A barrier reef  is one which runs parallel to the shore, separated by a channel of  water.  Reef: The Great Barrier Reef is a coral reef.   When people say reef, they imply coral reef.. Corals, and other things like coralline algae, are what form reefs.     Corals are Cnidarians, the same ph â¦ ylum as anemones and jellyfish. Being a Cnidarian, a coral contains nematocysts to sting and capture prey in their tentacles.