Most important economic use of marine birds?

Which taxon group is more specific, in regards to organisms that are in that group? mammalia animalia

The fruit of a certain plant is sweet and fleshy. the seeds of this plant have a seed coat that is fairly tough. the seeds germinate better if they are exposed to acid, or scarification. what is the most likely type of dispersal for this seed? water animal wind

How can an organ, such as the lungs, work for multiple body systems?