Why have marine fish stocks been depleted significantly in the last 75 years?

90% of fish stocks are used up – fisheries subsidies must stop ... Year after year, we have been pushing the boundaries of the ocean's ... Nearly 90% of the world's marine fish stocks are now fully exploited, overexploited or depleted. ... underpinned the dramatic decrease of fish stocks in the last 40 years, ...

Explanation:

ish catches have declined markedly and are likely to fall further, a study has found, with warming oceans to blame. ... The findings come from a study that has used “hindcasting” methods to reconstruct the effects of global warming, overfishing and other impacts on fisheries over the 80-year period from 1930 to 2010

Explanation:

that is wrong, its not thymus.

the correct answer is: b. pantala flavescens, because these organisms would have a high level of genetic variation due to sexual reproduction.  

because involves two organisms (parents) whose genetic material combines, sexual reproduction leads to genetic variation in new generations of offspring. the offspring is an unique organism, with new genome, more protected with the higher ability to adapted. this process is fundamental to evolution.