What organs do amphibians use in gas exchange

What are the formed elements (cell or parts of cell) in blood and what are their functions ?

An example of internal feedback working to maintain homeostasis is your a. decreased respiration rate when you are studying b. decreased heart rate when you are sad c. increased respiration rate when your muscles need more oxygen d. increased heart rate when your lungs need more oxygen

Give three examples of plant activities that are affected by circadian rhythms and natural fluctuations in the length of daylight?