The First Organisms to Release Oxygen by Photosynthesis Were

question 63

Multiple Choice

The first organisms to release oxygen by photosynthesis were:

• A) gymnosperms.
• B) green sulfur bacteria.
• C) algae.
• D) flowering plants.
• E) cyanobacteria.

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Definitions:

Quartet

In NMR spectroscopy, a signal split into four peaks of specific pattern and intensity ratio, typically arising from a proton coupled to three equivalent protons.

Triplet

A term relating to a quantum state where an atom or molecule has two unpaired electrons that have parallel spins, significant in spectroscopy and quantum mechanics.

NMR

Nuclear Magnetic Resonance, a spectroscopic technique used to observe local magnetic fields around atomic nuclei, providing detailed information about the structure, dynamics, and chemical environment of molecules.

Singlet

A term used in quantum mechanics and spectroscopy to describe a state in which all electrons in an atom or molecule are spin-paired, showing no magnetic field external to the system.