Describe the different cell types and their functions in sponges.

Sponges belong to phylum Porifera.

Different cell types and their functions are as follows:

1. Pinacocytes - It forms the outer layer of the sponge. It sometimes helps in phagocytosis of food particles.

2. Lophocyte or Collenocyte - these cells secretes collagen.

3. Porocyte - it controls the water flow through ostia.

4. Amoebocyte - provides nutrients to the cell.

5. Chanocyte - generates water current and filters food particles from water.

6. Sclerocyte - secretes silica spicules.

7. Oocyte - egg cell.

ysosomes are membrane-bound vesicles that contain digestive enzymes, such as glycosidases, proteases and sulfatases. lysosomal enzymes are synthesized in the endoplasmic reticulum (er), are transported to the golgi apparatus, and are tagged for lysosomes by the addition of mannose-6-phosphate label.

explanation:

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explanation:

plate tectonics and volcanic euptions

over time, plate tectonic processes cause continents to move to different positions on the globe.

for example, britain was near to the equator 300 million years ago, and therefore was hotter than it is today. for further details look at our climate through time poster or online map.

the movement of the plates also causes volcanoes and mountains to form and these too can contribute to a change in climate.

mountain ranges formed by plate tectonics. large mountain chains can influence the circulation of air around the globe, and consequently influence the climate.   warm air might be deflected somewhere cooler by the mountains.