Answer:
Two characteristics are a notochord, and a dorsal hollow nerve cord.
Hope this helps! :D
Nitrogen. Rocks have nitrogen in them. But just to be sure you should also just look it up to see if I am right.
=3x14 - 13x2 + 4
Apply the FOIL method: (a+b)(c+d) = ac+ad+bc+bd
Which will look like this:
(3x2 x2 + 3x2 (-4) -1 TIMES x2 -1 TIMES (-4)
And then simplify
It is also found in groundwater
