The key to good conclusions is to establish standards for what is expected and then model it . A solid conclusion should always relate back to the original hypothesis, describe how the relationship works, and relate how the data supports this conclusion. Conclusions are often inferences drawn from what observations and data imply. In biology, conclusions often must describe the limits of the relationship, for example, in hatching brine shrimp eggs, brine shrimp may hatch in distilled water, but they die in short order. Hatching success increases with salinity up to a point in which salinity begins to decrease the hatching response.
Enzymes are another good example where a range in the relationship occurs.
This means that relations are not always explicit and clear cut. The physical sciences are not plagued by this problem as much as the biological sciences.