What percentage of the trash in the Great Pacific Garbage Patch comes from sources on land

The circles, or orbits, for electrons are called energy levels. each level can hold only a certain number of electrons. add electrons to each level until you can't add any more. how many electrons can each level hold?

Study the diagram of a cell. which structure is found only in plant cells and functions in the process of photosynthesis? w x y z

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?