chlorine has two stable isotopes, cl-35 and cl-37. if their exact masses are 34.9689 amu and 36.9695 amu, respectively, what is the natural abundance of cl-35? (the atomic mass of chlorine is 35.45 amu.)

Spider crabs live in the shallow regions of the ocean floor. algae tend to grow on the surface of spider crabs. the algae provide the crabs protection from predators by camouflaging them. the spider crabs give the algae shelter. what does this description suggest? 1. the algae are parasites of the spider crabs. 2. the algae and the spider crabs have a mutualistic relationship. 3. the spider crabs are commensals, and the algae are parasites. 4. the spider crabs benefit from the algae living on them. 5. the spider crabs are parasites of the algae.