Place the following elements in order from MOST to LEAST reactive: -Carbon (C)
-Iridium (Ir)
-Helium (He)
-Sulfur (S)
-Hydrogen (H)

5) these are organisms where the genetic material is not bound by a nucleus. they are usually unicellular.

It is believed that europa, one of jupiter’s moons has an ocean beneath its surface. based on how earth’s oceans and atmosphere are believed to have formed, what can be said about europa’s supposed ocean? the arrival of in the early days of europa’s existence could have formed its ocean. it is likely that the water experienced , similar to earth. it is also possible that this water is retained beneath europa’s surface and in its atmosphere due to europa’s .

What were the main components of earth’s earliest atmosphere? oxygen and ammonia hydrogen and helium oxygen and nitrogen hydrogen and nitrogen