Are oxygen 16 and oxygen 18 isotopes stable or unstable as r

Are oxygen 16 and oxygen 18 isotopes stable or unstable (as relates to how they are evaluated for determining whether extinct whales likely inhabited freshwater or saltwater)? Which economic thinker, who specifically influenced Darwin, proposed how populations were limited by a finite supply of available resources? Which event occurred first? The Great Oxygenation Event, the first fully terrestrial (land) animal (millipede-like), or the mass extinction of dinosaurs.

Solution

section C 1 they are unstable

section C 2 Malthus

section C 3 The great oxygenation event occured first

section C 4 G and B