Identify one marine species with an outer layer which is similar to the chamois cloth, and one with an outer layer which is similar to the feathers.

Echinoderms which are among the very simple invertebrate animals in the aquatic ecosystem of essentially any part of the world and also among them we can search species such as sea cucumber, salmon and codfish, they have a chamois cloth-like outer layer, then we have the Crinoids.

There is another example of aquatic species with a feather, regularly they are known as sea lilies and feather stars, they have a hard calcite skeleton they were so plentiful in the Paleozoic seas that their remains made large limestone thicknesses.

correct answer is option a.

tropopause, stratopause and mesopause have all in common aspect that is point of maximum temperature in its layer of the atmosphere. all layers of atmosphere observe abrupt change in temperature. tropopause is the boundary between troposphere and stratosphere. stratopause is the boundary between stratosphere and mesosphere. mesopause is the boundary between mesosphere and thermosphere. these all boundaries are ranges between altitude of 0 to 80 km.