Answer: 133 km/h
Explanation
A is true, the others are not. I would assume they count the mRNA and tRNA in protein synthesis as 'double stranded'
Prokaryotic cells lack a nucleus.
The cycle of heating, rising, cooling and sinking is called a convection current. These currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over.