Examlex
Which of the following sources of productivity is the most difficult to acquire?
Retrovirus
A type of virus that uses RNA as its genetic material and reversely transcribes its RNA into DNA for integration into the host's genome.
Photoautotrophs
Entities that perform photosynthesis, creating nourishment from carbon dioxide and water by harnessing the energy from sunlight.
Chemoautotrophs
Organisms that obtain their energy through the oxidation of inorganic molecules, rather than from sunlight.
Photoheterotrophs
Organisms that obtain energy from light but require organic carbon sources for growth and development, unlike plants which can fix carbon dioxide.
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