Examlex
The new, high-yield crops require which of the following that cannot be supplied by subsistence agriculture?
Hydrozoans
A diverse group of mostly marine animals from the class Hydrozoa, which includes both solitary and colonial species like the Portuguese man-of-war.
Poriferans
A phylum of aquatic invertebrate animals known as sponges, characterized by their porous bodies and lack of organized tissues and organs.
Suspension Feeders
Organisms that feed by filtering suspended particles and small organisms from water.
Autotrophs
Organisms that can produce their own food from inorganic substances using light (photoautotrophs) or chemical energy (chemoautotrophs).
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