animals_1 - A Brief Introduction to A Brief Introduction to...

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Unformatted text preview: A Brief Introduction to A Brief Introduction to Animal Diversity Animal Diversity Characteristics common to most animals Eukaryotic Multicellular Heterotrophic Have specialized cells Capable of locomotion at some point in life cycle Can respond adaptively to external stimuli Can reproduce sexually Characteristics common to most animals Body organization Specialized collections of cells called tissues to carry out functions necessary for life. Ex. nervous and muscular tissues allow for responses to external environment Organs : composed of multiple tissues Ex. Stomach, kidney, skin Organ systems : collection of organs that carry out some specialized task Ex. Digestive system Characteristics common to most animals External or internal skeletons to provide support Muscles that allowed them to move in search of food Brains and nervous systems for integration of stimuli Internal digestive systems . Characteristics common to most animals Sexual reproduction Sperm and egg unite to form a zygote Zygote undergoes cleavage Multiple cell divisions result in a blastula Blastula undergoes gastrulation Characteristics common to most animals Most reproduce sexually There are some exceptions Cnidarians can form buds that pinch off to form new individuals Some lizard species have no males Bdelloid rotifers have been reproducing asexually for at least 40 million years and undergone substantial differentiation into species differing in morphology, habitat, and behavior. BdelloidMovieShort[1].mov Importance of Animals Animals Play key roles in ecosystems and provide useful products for humans Are consumers Herbivores Carnivores Decomposers...
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animals_1 - A Brief Introduction to A Brief Introduction to...

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