Lichens are among the slowest-growing organisms, but their tolerance of environmental extremes enables them to colonize habitats where few other macroscopic organisms can grow. they grow where neither the fungal partner (mycobiont) or the photosynthetic partner (photobiont) could survive alone, because they benefit from their unique symbiotic association. what mutualistic behaviors aid in the survival of both organisms?

a) the photobiont processes and provides nitrogen and carbon products to the mycobiont.
b) the photobionts are protected and able to grow in conditions in which they could not grow alone and in return release glucose in some form to the mycobiont.
c) the photobionts absorb mineral nutrients from the underlying surface or from minute traces of atmospheric contaminants while the mycobionts synthesize organic nutrients from carbon dioxide.
d) the photobionts produce ammonium and organic sodium compounds from n2 gas by sodium fixation; that in turn, aids the mycobionts in producing enzymes to decompose the substrate on which they live.

The correct option is B.

Explanation:

Lichens  is regarded as a mutual relationship between a mycobiont and photobiont, the relationship is targeted at enhancing their survival in extreme environments. The mycobiont is a fungal while the photobiont is usually a green alga or a mycobacterium. Each of the organism has their specific tasks; the mycobiont provides suitable habitat for the photobiont while the photobiont provide energy for the whole system.

americans began to notice growing differences between the northern and southern sections of the country. there were more people living in cities in the north, which made it more urban. more people lived on farms in the south, which made it more rural. while many people were farmers in the northern states, there were now other ways to make a living, such as working in mechanical cotton gins factories manufacturing cloth, tools and other goods. people in the north supported high tariffs on goods imported from europe because the extra cost encouraged people to “buy american” instead. in the southern states, planters did not like tariffs because they sold most of their production to europe and bought their tools from there as well. southerners believed the protective tariff was something that only northern factory owners keep their profits high. so the southern politicians came up with an idea. they would opt out. they would simply ignore the protective tariff. it was ‘null and void’ in south carolina. the state would not collect the taxes on goods imported into south carolina, no matter what the president said they had to do. this decision led to the nullification crisis.

yes it is   dangerous

explanation:

because that foot is discusting and could get you sick