What type of cloud is high and blanketlike, causing a halo from light source

How can a geological time scale best be reconstructed? a) comparing vestigial structures in living species b) comparing homologous structures in living species c) examining homologous structures in fossil remains d) examining the written records of scientists from past cultures

As an asteroid comes close to earth, it's name will change to? apex

What kind of sugar is found in a nucleotide?