photosynthetic organisms have the highest productivity.
photosynthetic organisms have the highest productivity.
what types of organisms have the highest productivity?
photosynthetic organisms
in modern underwater mats the top layer often consists of photosynthesizing cyanobacteria which create an oxygen-rich environment, while the bottom layer is oxygen-free and often dominated by hydrogen sulfide emitted by the organisms living there. it is estimated that the appearance of oxygenic photosynthesis by bacteria in mats increased biological productivity by a factor of between 100 and 1,000. the reducing agent used by oxygenic photosynthesis is water, which is much more plentiful than the geologically produced reducing agents required by the earlier non-oxygenic photosynthesis. from this point onwards life itself produced significantly more of the resources it needed than did geochemical processes. oxygen is toxic to organisms that are not adapted to it, but greatly increases the metabolic efficiency of oxygen-adapted organisms. oxygen became a significant component of earth's atmosphere about 2.4 ga. although eukaryotes may have been present much earlier, the oxygenation of the atmosphere was a prerequisite for the evolution of the most complex eukaryotic cells, from which all multicellular organisms are built. the boundary between oxygen-rich and oxygen-free layers in microbial mats would have moved upwards when photosynthesis shut down overnight, and then downwards as it resumed on the next day. this would have created selection pressure for organisms in this intermediate zone to acquire the ability to tolerate and then to use oxygen, possibly via endosymbiosis, where one organism lives inside another and both of them benefit from their association.
evolutionary history of life
list of swiss global air lines destinations









































swiss global air lines operations were fully integrated into the route network of its parent company. this is a list of destinations served by swiss global air lines on behalf of swiss international air lines as of august 2015. swiss global air lines was dissolved and merged into its parent by 19 april 2018.









































section::::destinations.









































section::::destinations.:africa.









































bullet::::- algeria









































bullet::::- algiers - houari boumediene airport









































section::::destinations.:asia.









































bullet::::- hong kong









































bullet::::- hong kong - hong kong international airport









































bullet::::- israel









































bullet::::- tel aviv - ben gurion airport









































bullet::::- singapore









































bullet::::- singapore - singapore changi airport
list of swiss global air lines destinations