C. The number of covalent bonds is equal to the number of unpaired valence electrons. For example, nitrogen and phosphorous both have 3 unpaired valence electrons thus forming 3 covalent bonds.
Answer:
C
Explanation:
The principle of superposition states that the oldest sedimentary rock units are at the bottom, and the youngest are at the top. Based on this, layer C is oldest, followed by B and A. So the full sequence of events is as follows: Layer C formed.
Answer:
it is a greenhouse gas witch traps heat
and it dissolves in the ocean causing fish to die and decompose creating more greenhouse gas
Explanation:
The answer is non-living elements and living species in a specific local environment, like water, hope this helped you.
