What is the characteristics of tropical air mass

How have the greenhouse gasses increased from the year 2000 to 2018

Sodium nitrite (nano2) reacted with 2−iodooctane to give a mixture of two constitutionally isomeric compounds of molecular formula c8h17no2 in a combined yield of 88%. draw reasonable structures for these two isomers. click the "draw structure" button to launch the drawing utility. place the two compounds in the appropriate boxes below.

What produces wave a)sound b) heats c)transfer of energy d)vibrations