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Lecture 39

BIOL 1010 Lecture 39: Lecture 39
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Department
Biological Sciences
Course
BIOL 1010
Professor
Emily A.Mc Kinnon
Semester
Fall

Description
OS82 Bio 1010 Chapter 20 Section 20.1 – Animal Evolution & Diversity – What is an animal? Animals are: Multicellular, heterotrophic Eukaryotes that obtain nutrients by indigestion. Ingestion means eating food – this mode of nutrition contrasts animals with fungi, absorbing nutrients after digesting food outside their body. Animals digest food in their bodies after ingesting other organisms. Animal Cells: Animal cells lack cell walls that provide strong support in the body of plants & fungi. Animal cells are held together by extracellular structural proteins (most abundant is Collagen), & by types of intercellular junctions. All animals have muscle cells (movement), & nerve cells (conducting impulses). Animal Reproduction & Development: Most animals are Diploid & reproduce sexually. o Only Haploid cells in animals – Eggs, & Sperm. FIGURE 20.1B ----------------------------------------- - Male & Female make Haploid gametes by Meiosis. (Plants/Fungi produce Spores) When egg & sperm fuse during fertilization. Zy
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