Put the stages of the formation of a dead zone in their correct order. Large number of fish and other marine life die, surface biomass blocks sunlight and prevents photosynthesis, high levels of microbial activity consume oxygen, excessive amounts of nitrogen and phosphorus promote aggressive biomass growth, surrounding water becomes hypoxic or anoxic, root vegetation and phytoplankton decompose.

Will mark brainliest how many electrons can be held in the energy level n = 4?

Select the correct value for the indicated bond angle in each of the compounds. o−o−oo−o−o angle of o3 90° 109.5° < 109.5° 120° < 120° 180° f−b−ff−b−f angle of bf3 180° < 109.5° < 120° 120° 109.5° 90° f−o−ff−o−f angle of of2 < 120° 120° 90° 109.5° 180° < 109.5° cl−be−clcl−be−cl angle of becl2 90° 109.5° 180° 120° < 109.5° < 120° f−p−ff−p−f angle of pf3 90° 109.5° < 109.5° 180° 120° < 120° h−c−hh−c−h angle of ch4 90° < 109.5° 180° 120° < 120° 109.5°

What is the oxidation state of each individual carbon atom in c2o42−?