Can someone fill in the blank thank you will give brainliest

An enzyme lowers the energy of activation. what does that mean?

In some plants, pointed leaves (p) are dominant over rounded leaves (p). a plant with a genotype of pp

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