Which of the following is true of rna compared to dna?
a. it lacks phosphate groups.
b. it is a single-stranded molecule.
c. its nucleotides do not have sugars.
d. it contains four different nucleotides.

The diagram shows a fossil of an ancient whale skull and a skull of a present-day whale. the ancient whale is extinct and is believed to be an ancestor of the present-day whale. what do these skulls most likely show that supports darwin’s theory of evolution? all populations can adapt and survive. only some organisms have a common ancestor. populations change slowly over time. populations rapidly become extinct.

Did you know that a blue wales tongue weighs more than an elephant?

What do nitrifying bacteria convert