1.which of the following is true about light and depth in an aquatic ecosystems? a. light increases as depth increases b. light decreases as depth increases c. light stays the same as depth increases d. light is not dependent on depth 2.a student collects a sample of water in florida with a high salinity. where is the most likely place for this water to have come from? a. st johns river b. pond at school c. atlantic ocean d. lake okeechobee

Answer 1:

            The correct option is B. “Light decreases as depth increases”.  

Explanation:

             Light is one of the most important environmental factor the determine the depth of ocean and divide it into different zones, which are listed below:

1. Photic zone:

               This zone is composed of phytoplanktons which photosynthesize and prepare their food in the presence of sunlight. This zone reaches to 200 meter from surface.

2. Aphotic Zone:

                   The zone in water colum deeper than 200 meter where light cannot penetrate is known as aphotic zone.  

Answer 2:  

             The correct option is C.

Reason

           Based on presence of dissolved salt water body can be classified into two main groups.

1. Fresh water:  

            Water which contain less than 1gram of dissolved solids per liter is known as fresh water.  

Example:

               Lakes, river, stream and even under ground water.

2.  Sea water:

              Water which contain more than 1 gram dissolved solids per liter is known as sea water. Sea water contain more salt as compared to fresh water and increases due to evaporation of water from surface. Sea water has a salinity of about 35 gram per liter of water.  

Example:  

              Water from sea or ocean.

Conclusion

              From the above description it is cleared that student who collects a sample of water in Florida with a high salinity level Atlantic ocean. Because St John river, pond at school and lake Okeechobee belong to fresh water body.  

answer; //the above statement is (false);

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.