[Solved] All PowerPoint themes include a Colors gallery. Influenza: Influenza is a highly contagious viral infection that affects the respiratory system, causing seasonal epidemics and occasional pandemics. Viral Passage: The process by which a virus is grown in cells or organisms over multiple generations, leading to potential changes in its virulence or transmissibility. Morphological Features: Traits or attributes of an organism's form and structure, including shape, size, and arrangement of parts, visible under a microscope or with the naked eye. Artiodactyls: A large group of hoofed mammals that includes both domesticated and wild species such as pigs, cattle, deer, and camels, characterized by an even number of toes.