1. Why do they call the horseshoe crab "a living fossil"? 2. What evidence de scientist collect that backs up this phrase the horseshoe crab is "a living fossil"?

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

Describe the layers of the suns atmosphere?

Organisms may contain up to five levels of organization within their bodies. which level of organization is shown by the liver? a. tissue b. organ c. organism d. organ system