Which of the following represents the concept of RNA? a) It consist of one strand.
b) It's sequence comes of the DNA strand.
c) Instead of Thymine, it uses Uracil as a nitrogenous bases.
d) All of the above.

Why are carbon dioxide concentrations expected to increase? a carbon dioxide concentrations are expected to increase, because fossil fuel burning is expected to increase b. carbon dioxide concentrations are expected to increase, because of an increase in agriculture. c.carbon dioxide concentrations are expected to increase, because more land will have to be cleared for increasing populations and agricultural use. d. all of the above select the best answer from the choices provided mark this and return save and exit next submit submit