Answer;
Without the keystone species, the rocky inter-tidal ecosystem would be dramatically different or cease to exist altogether
Explanation;
Keystone species have low functional redundancy. This means that if the species were to disappear from the ecosystem, no other species would be able to fill its ecological niche.
For instance; the starfish Pisaster ochraceus is a keystone species in the rocky marine inter-tidal communities off the northwest coast of North America. It feeds on the mussel Mytilus californianus and is responsible for maintaining much of the local diversity of species within certain communities.
<span>Jamal seems to be suffering from depression. There is nothing wrong with him physically and health wise he could be doing just fine but mentally there is a deficiency. For whatever reason the depression has arisen, it has taken all motivation and the will out of Jamal making he's current existence to seem unbearable.</span>
Answer:
Both options are true.
Explanation:
The cylindrical epithelium is a simple epithelium, which is characterized by having a cell layer, where all the cells are supported on the basement membrane, and its nucleus has reverse polarization in relation to the rest of the cells of our body, that is, they are found in a not very common position.
Simple cylindrical epithelia are found in areas of absorption or assimilation and exchange of gases or nutrients, since this shape is what allows them optimal diffusion through the epithelium, an example of the tissues in which this cellular architecture is found. They are the intestinal tract and the respiratory tract.
In the case of pseudostratified epithelium, it is very similar in function to the cylindrical one, with the difference that it gives a multilayered appearance, that is, its cells are stacked one from the other, giving the appearance of more than one epithelial layer as the stratified epithelium of our epithelial organ, but nevertheless it is not like that, there are many cells of irregular shape with a support in the basal one, that is why it is a single layer.
This last epithelium is also found in the airways in large numbers.
The gastrovascular cavity differs from the alimentary canal in that only the gastrovascular cavity has only a single opening. Gatrovascular cavity is the actual organ of digestion and circulation in the animal phyla Cnidaria and the Platyhelminthes. Alimentary canal unlike the gastrovascular cavity has two openings, the mouth on one end and the anus on the other end. Food goes in the mouth, while waste comes out the anus.
