Speed is scalar quantity bode velocity is a vector quantity

beause speed have magnitude but no direction but velocity have both.

because velocity have both magnitude and direction but speed has only magnitude but no direction .

rising sea temps which are causing coral reefs to bleach and die out

glaciers are melting causing sea levels to rise wgich could flood out land

explanation:

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.