Barley Gene Lowers Emissions From Rice Over half the people on the planet eat rice as a staple food. Growing rice emits methane, a potent greenhouse gas-to the tune of 25 million to 100 million tons of
methane every year, a notable contribution to human-caused greenhouse gas emissions... When rice paddies are flooded, methane-producing bacteria thrive on the
carbohydrates secreted by rice roots in the oxygen-free soils. The rice plant itself acts as a conduit (pathway), transmitting methane from the soil into the atmosphere...

Now that the scientists have developed this new variety of rice plant, identity one method that could be used to produce large quantities of only these beneficial plants.

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.

the correct answer to this question is #5

yes, because even though a theory has a  lot of evidence to support it, it is not always true

that's all i luck!