Three organs that are part of the digestive system even though food does not pass through them

Why did adult crab numbers decline in he ecosystem, even though sea stars were still available?

The term facultative anaerobe refers to an organism that

Match the order of the levels of organization in nature with the correct description. example: atoms are fundamental units of matter= level 1levels- 2,3,4,5,6,7,8.now what levels are these? population consists of organismscells consist of moleculesecosystems consist of communities interacting with there environmentmolecules consist of atomsthe biosphere consist of all ecosystems on earthcommunities consists of populationorganisms consist of cells