Which freshwater ecosystem is least productive?
O A. Stream
B. Bog
C. Marsh
D. Swamp
SUBMIT

B-bogs
explanation-bogs drain poorly, meaning the soul becomes too saturated to support nutrients

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.

The think of process to make something successful