Which of the following represent examples of how cells in multicellular organisms can communicate with each other to coordinate their activities? Select all that apply.

- nucleus of eukaryotes
- hormones
- nervous system
- red and white blood cells

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 organisms listed below performs nitrogen fixation? a. legumes b. plants c. bacteria d. fungi

Which of the following forest management practices is best for reestablishing areas of forest?