Which of the following describes what happened to wetlands after agricultural expansion? A: They were drained for irrigation.
B: They became polluted from mining.
C: They were converted to swampland.
D: They were used for railroad pathways.

Certain agricultural crops thrive in the moist, rich wetland soils, while wetlands near agricultural lands receive nutrient inputs to maintain an ecosystem balance. More importantly, this relationship shows the intricate balance between viable food and fiber production and preser- vation of natural resources.

Explanation:

the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.