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Osmotic balance is critical for fishes to maintain, particularly those that move between waters with differing concentration gradients of solutes, particularly salts. Anadromous fishes such as many of the members of the family Salmonidae migrate between marine and freshwater habitats for reproduction, and provide insight into many aspects of osmoregulation in fishes. In thinking about the evolution of the bony fishes, which evidence suggest first emerged in freshwater habitats, a key question relates to how the bony fishes were able at some point to invade marine habitats. Forms that migrate between marine & freshwater habitats (such as Pacific Salmon) may provide some clues to that evolution.
For this reflection, speculate on whether the ancestral line of the Salmonid fishes were marine in origin or freshwater in origin. That is, did anadromy in the Pacific Salmon evolve from 1) an ancestor that lived in the ocean but at some point gave rise to fishes that lived in the ocean but began moving to freshwaters to reproduce or 2) an ancestor that lived in freshwater but at some point gave rise to fishes that lived in freshwater streams but made excursions into the ocean for periods before returning to the streams for reproduction?
Important functions of skeletal system involve: protection of the brain and soft organs. storage of water. production of Vitamin E.
When ten molecules of pyruvic acid are broken down completely to CO2 and H2O in the presence of oxygen, how many molecules of ATP will be produced?
Why does some scientist think that areas protected from the otmosphere might have favoured the production of organic compounds on early earth.
Describing how the brain transmits the message to muscles. Trace impulse, list the steps in as much detail as possible, from which your brain transmits the message to the suitable muscles in order to step up one step.
In 1996, after reflecting on evidence of evolution that has been accumulating for more than a hundred years, Pope John Paul II acknowledged that the theory of evolution.
Perform visual comparison of the assigned two putatively related nucleic acid sequences x and y. Indicate in your answer the identities by 1s on match and 0s on mismatches. Also indicate mutations by the scoring indices S for transition and V for ..
At room temperature, equilibrium potential of K+ in a cell with internal concentration of K+ 10 fold higher than that of external concentration will be approximately.
The performance of a seed can be determined by studying its germination and viability potential.give One of the most significant advances in seed testing.
When a fruit fly of genotype Mm Nn Oo is mated to another fly of identical genotypes, what proportion of the progeny flies will be MM nn Oo.
Which pair will have been likely to agree that strata such as those depicted here were deposited gradually over long periods of time by subtle mechanisms that are still at work?
Explain anaerobic respiration in terms of an electron transport chain, proton motive force, electron donors and acceptors.
Transformation, conjugation, and transduction were discovered in the laboratory. How important are these mechanisms of genetic recombination in nature.how is electrophoresis used in criminal forensics.
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