Which of the Following Statements Is TRUE Regarding the Earliest

question 95

Multiple Choice

Which of the following statements is TRUE regarding the earliest photosynthetic organisms on Earth?

• A)These organisms likely possessed two photosystems.
• B)Given the abundance of H₂O on early Earth, these organisms used H₂O as an electron donor.
• C)The organisms likely used molecules other than water (i.e., H₂S)as electron donors.
• D)The organisms likely produced oxygen as a waste product, resulting in Earth's current atmosphere.
• E)These organisms likely used both inorganic molecules and water as electron donors.

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Definitions:

Test

A shell.

Actinopods

Protists characterized by axopods that protrude through pores in their shells. See rhizarians.

Amoebozoa

A group of amoeboid protozoa that move and ingest food with pseudopodia, comprising various free-living and parasitic species.

Plasmodial Slime Molds

Eukaryotic organisms that exist as a single mass of cytoplasm without cell walls during part of their life cycle, feeding on microorganisms in decaying plant material.