Biotic or abiotic factor

6. you notice algae growing on the sides of the tank and the rocks. is this an example of a biotic or abiotic factor? how do you know?

7. you decide to buy a snail to eat the algae on the sides of the tank and rocks. is this an example of a biotic or abiotic factor? how do you know?

8. while you’re at school the lightbulb for the fish tank burns out. is this an example of a biotic or abiotic factor? how do you know?

6. Algae are biotic factors. They are living organisms which have the capability to produce food through photosynthesis. It acts as a producer. Also they appear on the wall of tank  through reproduction , which is characteristics of living being.

7. Snail is also a biotic factor like algae. They are classified as consumers. They feed on algae to survive with in the tank. They move while feeding on algae and movement is an important trait of living being.  

8. Light Bulb is an abiotic factor. Though it is an essential requirement for fish to survive but since it is not a living being , it is considered as abiotic. While fish  on the other hand is a biotic factor as it possess life in it.  

answer; /// i believe that the correct answer is (50%);

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.