The net annual primary productivity of a particular wetland ecosystem is found to be The net annual primary productivity of a particular wetland ecosystem is found to be 5,000 kcal/m^2/yr. if respiration by the aquatic producers is 11,000 kcal/m^2/yr, what is the gross annual primary productivity for this ecosystem, in kcal/m^2/yr

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

not only is it colder, it also becomes darker, less salty, and more dense.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.