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Why the sponges have not evolved into so...

Why the sponges have not evolved into something more elaborate during their long existence ( some hundreds of millions of years ?

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Sponges have not advanced evolutionarily because they were already well adapted and ecologically successfully since their early existence.
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PRADEEP-ANIMAL KINGDOM -Assertion-Reason Type Questions
  1. Why the sponges have not evolved into something more elaborate during ...

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  2. Assertion : Tube-within-tube body plan is the typical condition in the...

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  3. Assertion : Cephalization is advatageous to an animal Reason : It im...

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  4. Assertion. Pseudometamerism is found in tapeworms. Reason.Proglottid...

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  5. Assertion. Protandry and protogyny ensure cross fertilization. Reaso...

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  6. Read the given statements and select the correct option. Statement 1...

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  7. Assertion : Blood is colourless in the insects. Reason : Insect bloo...

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  8. Assertion. Hormones are carried to the target organs by blood. Reas...

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  9. Assertion. Homoeothermy provides faster metabolism. Reason. Enzyme a...

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  10. Assertion. Water current flowing through the canal system is of prime ...

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  11. Assertion.The cnidarians are a great nuisance to the humans swimming i...

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  12. Assertion. Coral reefs serve as stable marine ecosystems. Reason. Th...

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  13. Assertion. Egg is alecithal ( yokless) in the flatworms. Reason. Yok...

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  14. Assertion. The roundworms are eucoelomates. Reason. They have a flu...

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  15. Assertion. Coelom in the annelids is divided into compartmentsby trans...

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  16. Assertion. Blood does not clot as a leech is sucking it. Reason. An ...

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  17. Assertion. Oysters and clams produce pearls. Reason. They are cultur...

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  18. Assertion. Sepia emits a dark cloud of ink when persued by an enemy. ...

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  19. Assertion. Many female insects emit pheromones into the air. Reason...

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  20. Assertion. Arthropods undergo periodic ecdysis during their growth. ...

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  21. Assertion. Ambulacral system of echinoderms contains water. Pores in...

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