What type of RNA is shown below?

A- mRNA
B- tRNA
C- rRNA
D- snRNA

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?

Nucleic acids offer variability because they contain alternate forms of genes called .

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.