A porcupine has an internal skeleton and a rose has a stem. Write a sentence to explain how these physical structures have different functions.​

Biology 1c cumulative exam i need awsners

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

20 the compound al(nh3)2 has atoms of nitrogen.