Coral bleaching occurs when the zooxanthellae algae that live in coral leave or die due to stress. which of the following is the best evidence of a mutualistic relationship between zooxanthellae and coral rather than commensalism? corals are stressed and more likely to die without zooxanthellae; the zooxanthellae grow best when associated with the corals. corals deliberately expel the zooxanthellae when under stress. zooxanthellae give corals their bright colors. zooxanthellae provide nutrients to the corals, but corals can survive without zooxanthellae.

Which of the following scenarios is an example of the bottleneck effect? answers a in south africa, much of the afrikaner population is descended from a small number of dutch colonists. in this population, this is an unusually high frequency of pseudoxanthoma elasticum (pxe), an elastic tissue disorder. b four white-tailed deer are introduced to a park in finland. thirty years after their introduction scientists compare the genes in the population and find that there is no variation. c during the industrial revolution, london's air became filled with soot. as a result, birds started eating more of the lighter moths because they were easier to spot than their darker counterparts. over time, the moth population changed so that there were more darker moths than lighter ones. d 10% of the population of american alligators in an area have the recessive trait albinism. a massive flood results in the death of 80% of the population. of the remaining population, 60% have the recessive trait of albinism.

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d

Light sensitivity in euglena is provided by the