D. an observation that has a number associated with it.
Sewage water outlet is the best example of non-point pollution.
These two phyla are Annelida and Arthropoda. The Annelids are segmented worms, and include earthworms<span>, and </span>leeches. These worms occur widely, in marine, aquatic and terrestrial habitats. The Arthropods are invertebrates with an exoskeleton<span>, a </span>segmented<span> body, and paired jointed </span>appendages<span>. These include</span><span> </span>insects<span>, </span>arachnids<span>, </span>myriapods<span>, and </span>crustaceans<span>. </span>