1. Explain the differences between viruses, protists, and fungi. Provide specific examples (and explain how they are examples!) to explain how and why they are classified into their own categories.

Viruses do not have structures and thus cannot move on their own...Typically, fungi are non-mobile organisms...These move by cilia or flagella...Animal like parasites have false feet...Protists are mostly unicellular organisms, whereas the fungi are mostly multicellular organisms...Protozoans, algae and molds are the three types of protists... Protists can be either heterotrophs or autotrophs...Fungi contain a cell wall, which is made up of chitin...irus is a pathogenic microscopic organism...Viruses cannot multiply on their own, so they have to invade a 'host' cell...Pathogenic fungi are yeasts and moulds which can infect humans...Parasites are organisms that live on other organisms...

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blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.