I need help plz

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

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above

Achemical that is released by an animal as a signal to other members of the same species is called a pheromone. t or f