Define the term poriferans
Define the term poriferans?
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The phylum Porifera includes the simplest creatures of the animal kingdom. Sponges are aquatic sessile beings (that is, they are not capable to move by themselves and they keep themselves joined to substrates), they do not contain tissue diversity and their bodies contain pores (feature subsequent to which their name comes). They are multicellular, similar to all beings of animal kingdom.
What is meant by the gastrulation? How during gastrulation first two germ layers are formed? Specify these germ layers?
What is the idea of universality of the genetic code? Explain the exceptions to this universality?
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Explain the term diffusion?
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How extracorporeal digestion allocated to predation in the arachnids?
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