Which of the following molecules is the least polar?
(a) ph₃
(b) ch₄
(c) h₂o
(d) no₂
(e) hcl

The modern periodic table has groups.

When a comet collides with earth, it adds material to our planet and causes great damage. therefore, a collision like this is a a. destructive force b. constructive force c. geologic process and event d. constructive and destructive force

Chromosome 17 is made of over million base pairs.