LIFESCI 2 Lecture 24: Animal Diversity 11/17
Document Summary
Heterotrophy: obtain necessary carbon compounds from other organims, most ingest their food rather than absorbing it, 3. ) Motility: move under their own power at some point in life cycle, 4. ) Crab single plane symmetry runs from mouth to tail, have a distinct front: diversity of sensory receptors head region. 1. ) contact triggers the ejection of nematocysts. Nematocysts of some cnidarians inject toxins into predators or prey: ex. ) Box jelly: colonies of cnidarians: reef-forming coral, coral & algal endosymbionts: mutualism (+/+) ^^ they"re primary producers providing carbon for the corals: coral bleaching. Loss of zooxanthellae (algae) in response to thermal stress. The algae keep synthesizing & making more oxygen. When stressed, lots of oxygen is harmful so corals spit out the algae. If coral doesn"t get new algae to inhabit it, coral will die. Invasive species in black sea was accidentally introduced through shipping cargos bc boats are pumping water in and out constantly: major ecosystem impacts.
