involves chemical signals to coordinate the body functions of vertebrates. endocrine system integumentary system respiratory system excretory system 0000

Gas bladders make up an average of 5 percent of body volume in marine fish and 7 percent of body volume (on average) in freshwater fish. What is the reason for this difference?   freshwater fish have a larger average body size than salt water fish it is more difficult to produce lift swimming in freshwater than swimming in saltwater freshwater fish need to have a lower overall body density in order to remain neutrally boyant freshwater fish need to have a higher overall body density in order to remain neutrally boyant

FISH AMPHIBIANSS REPTILES BIRDS МАММALS Gills when young then lungs as Breathing Gills adults. Adults Lungs Lungs Lungs breathe through their skin. Body Covering Smooth, moist skin Scales Fur over soft skin Scales Feathers Most lay jelly- Live birth & feed Soft, leathery- shelled eggs Reproduction like eggs Lay jelly-like eggs Hard shelled young milk from eggs mammary glands Heart 2-chambers 3-chambers 3-chambers 4-chambers 4-chambers (very (very efficient) efficient) Temperature Ectothermic Ectothermic Ectothermic Endothermic Endothermic Regulation Questions: 1. If you discover a new organism that is ectothermic, contains lungs to breathe and has scales, in which category of vertebrates should you classify the new organism? 2. If you find an organism that has a 4-chambered heart and fur, in which category of vertebrates should you classify the new organism? 3. Which organisms start out with gills but have lungs as adults? 4. Which group of organisms give birth to live young? 5. If you…

name three different molecules synthesized by the cells of vertabrates and briefly state each one's biological function