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diffentiate sharks and bony fish? What features of the skeleton and of the system for buoyancy diffentiate sharks and bony fish?

...gene, DNA, Base) in size? The most controversial part is between gene and DNA

...covers 450 square feet.? How many gallons will be required to paint the walls of this room? My answer was 2 since I counted walls of sides as 6 including top and bottom, but correct answer counted with only 4 sides. Why?

I know this question is little bit ambigous, could you still answer that question if you have to do so?

rules for each categories? 1. oxygen carbon dioxide exchange in tissues and lungs 2. urine formation in teh kidneys 3. depolarization of neurons and conduction of the action potential 4. proton gradient in mitchondria 5. exchange of materials between the maternal and fetal blood across teh...