Only when reproducing sexually or asexually might they become planktonic and drift in the current until eventually attaching to a suitable substrate. For most of their lives, sponges are also sessile, attached to a substrate such as rocks. Digestion takes place in individual cells, that is, intracellular digestion.
Sponges do not have nervous, circulatory, or digestive systems. The name Porifera refers to this porous structure. They feed by drawing water through numerous pores in their bodies and trapping detritus, bacteria, and plankton carried in the current. Sponges come in a variety of shapes and sizes, from large branched structures or giant cup shapes to flattened inconspicuous forms. Sponges are supported by a skeleton of secreted collagen or spongin protein and may have embedded structures called spicules, composed of calcium carbonate or silica. They are characterized by numerous canals and chambers that open to the outside via pores. It is possible to disassemble a sponge into a pile of individual cells and within weeks, the various cell types will aggregate into their former structure. They have aggregations of different cell types but do not have true tissues. They are the only animals that do not exhibit obvious symmetry in their body organization. Sponges are the simplest of the multicellular animals. Invertebrate Biology Laboratory Phylum Porifera Ready? Let's go and explore beneath!! Source And since I am having this laboratory exercise in our school, let me also share what I have learned from this exercise. 16.Hello Steemians! Science blogging time! Let's have a break and explore for a little while what's under the sea. Medical Term palliative iatrogenic dementia atrophy Meaning of Prefix 1. Consider a system whose state ∣ ψ ( t ) ⟩ |\psi(t)\rangle ∣ ψ ( t )⟩ and two observables A A A and B B B are given by
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