Within a population, variation increases the likelihood that some individuals will be able to survive if the environment changes. Which of the following causes variations within a population? changes in extinction rates
changes in the genetic material
changes in the breeding rate
changes in the environment

Answer is: sulfur, arsenic, selenium, silicon  and antimony.

1) Sulfur (S) can form, for example, sulfuric acid (H₂SO₄) or acidic oxide, sulfur(VI) oxide (SO₃).

2) Arsenic (As) can form arsenous acid (H₃AsO₃).

3) Selenium (Se) can form selenic acid (H₂SeO₄).

4) Silicon (Si) can form orthosilicic acid Si(OH)₄ and metasilicic acid SiO(OH)₂.

5) Antimony (Sb) can form antimonic acid, as the hydrate HSb(OH)₆.