| According to the heterotroph hypothesis, hydrogen was not a chief component of the atmosphere when life began. |
| This provides a rationale for a hypothesis respecting adstrate development in the area. |
| They may not have given sufficient weight to two other factors, one an arguable hypothesis and the other a central fact of British politics. |
| Although these results do not definitively pinpoint the source of the steps, they confirm the earlier hypothesis that shortening is quantal. |
| Further data of the energetic cost of breeding for males and females of other ratite species would be valuable for testing that hypothesis. |
| They do not lend themselves, as entities or wholes, to scientific hypothesis testing. |
