Answer:
H2 is molecular hydrogen.it is a molecule of hydrogen that consists of two hydrogen atoms bonded together by one single bond. 2H denotes two moles of elemental hydrogen.it should be noted that elemental hydrogen is not bonded to anything.
Traditional forms shows the evolutionary steps between species
The definition of transpiration is "<em>the process by which moisture(water) is given off through plant leaves as water vapor.</em>"
The plant's leaves give off water in the form of water vapor, so the answer is transpiration.
There are more but birds would be a bad index fossils
I hope this helps!
