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When do comets generally begin to form a tail?
Sea Urchins
Marine invertebrates with spiny shells, belonging to the class Echinoidea.
Density-Dependent Factor
An ecological factor whose effects on a population vary according to the population density, such as disease or competition.
Population Size
The sum of people located in a specified region at a given time.
Nutrient Supply
The provision of essential dietary components necessary for organisms to grow, reproduce, and maintain their health.
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