The sugar in DNA is called deoxyribose sugar; while the one found in RNA is called ribose sugar and they are both pentose sugars with the only difference that DNA lacks one oxygen atom.
It is false. Sepals collectivaly called calyx protect the outermost part. Its the part that enclosed the developing bud. If you have ever seen a closed rose the green part that eventually opens and can be seen at the base of the flower is the sepal.
Viruses are not made out of cells, they can't keep themselves in a stable state, they don't grow, and they can't make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.