Which level of organization describes an oak tree forest with bacteria, fungi, dead leaves, butterflies, blue jays, stones?

A)biome
B)biosphere
C)community
D)ecosystem

Which other elements contain the same number of outer electrons as sodium

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

The appropriate concentration for an iodine sanitizer is