Ferns remain in identical phylum seeing that moss. Researchers get several hundred species of ferns. Ferns highly-developed subsequently mosses made an appearance. Ferns tend to be nonvascular crops.
 
        
             
        
        
        
<span>The size of population that can be supported indefinitely upon the available  resources and services of that ecosystem.
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GRIMNERGrowReproduceIrritability (ie, being able to sense changes in the environment, detect danger, etc.)MovementNutrition (eating and drinking)Excretion (get rid of waste materials)Respire (breathe)
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Characteristics of Lancelets:
Small
Elongated
Marine invertebrate
Lacks a jaw
No sense organs
Has a notochord
Example: Lamprey
Characteristics of Tunicates:
Marine invertebrate
Has an outer coat that is rubbery or hard
Has two siphons
Examples: sea squirts, salps