NationWide Specialist Laboratory have put together profiles of thyroid tests specifically for the greyhound breed. 1  Greyhound Thyroid Investigation (GTH1) â Sensitive TT4, TT3, TSH and TGAA. 2  Greyhound Thyroid Monitoring (GTH2) â Sensitive TT4, TT3 and Canine TSH.
Benthos in the intertidal zone include sea stars, barnacles, mussels, sea anemones, sea urchins, snails, and other creatures that attach themselves to the rocky substrate or burrow in the sand. Benthos in deeper zones include fish, crustaceans and tube worms.
The sunlit region near the surface in which photosynthesis can occur is known as the photic zone. The photic zone may be as deep as 200 meters in tropical seas, but just a few meters deep or less in rivers and swamps. âThe physical and chemical structure of the ocean provides habitats that marine organisms depend on.hotosynthetic algae, called phytoplankton, live in the photic zone. Zooplanktonâtiny free-floating animalsâeat phytoplankton. This is the first step in many aquatic food webs. Below the photic zone is the dark. aphotic. zone. , where photosynthesis cannot occur.