There are more species of living fishes than of all other species of vertebrates combined.
a. true
b. false

The given statement is true.

Explanation:

Fish are extremely miscellaneous species and can be classified in various ways. On the basis of FishBase, about 33100 species of fish had been illustrated in 2015, which is more in comparison to the entire combination of all the other species of vertebrate, that is, the mammals, reptiles, amphibians, and birds.  

The diversity of fish species is differentiated almost equally between the freshwater and the marine ecosystems. In the Indo-Pacific, the coral reefs form the center of assortment for the marine fishes, while the continental freshwater fishes are enormously concentrated in huge river basins of tropical rainforests, mainly the Congo, Amazon, and Mekong basins.  

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.