BIOL2000 Study Guide - Midterm Guide: Diploblasty, Protostome, Body Cavity
5 May 2020
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Requirements for an animal: multicellular, heterotropic, must move at some point in its life cycle. Common, but not necessary, features: nerve cells, muscle cells. With the exception of sponges, all animals have an epithelium. Diploblast: embryo has 2 layers of tissue (ecto and endoderm, triploblast (humans) (ecto, endo, and meso) At least 2 planes of symmetry: bilateral. Only a single plane of symmetry: sponge is the only asymmetric animal. Body cavity: called a coelom, protostomes. Tube within a tube design: extension of the environment. Least common sense among animals is sight. Moving has 3 functions: find food, find mates, escape predators. Eggs/embryo is inside the females body (live birth: oviparous. Female has eggs inside her . the yolk feeds the young, and then there is a live birth, but the yolk nourished instead of the mother. Study of how organisms interact with their environment. 3 key features in aquatic environments: nutrient availability, water depth, water movement.
