Sentence examples for and difficult to study from inspiring English sources

Dr. Stephen Kirby, geophysicist with the United States Geological Survey in Menlo Park, Calif., and a specialist in slab earthquakes, said these deep earthquakes are particularly inaccessible and difficult to study and there remain competing hypotheses as to how they are generated.

They are notoriously elusive and difficult to study.

The ecological process of selection, the domain of ecological genetics, is complicated and difficult to study.

The human brain is complex and difficult to study, which has impeded development of drug treatments for mental illnesses.

It is implausible, if not impossible, to gather detailed information on thousands of species of reptiles, many of which are secretive and difficult to study.

Because compensation policies have critical implications for the provision of health care, and evidence of their effects is limited and difficult to study in the real world, laboratory experiments may be a valuable methodology to study the behavioural responses of health care providers.

They are insoluble in both aqueous and organic solvents and consequently difficult to study biochemically and biophysically (Casadevall et al. 2000).

Abnormalities in emotional processing are common in human neurological diseases, but have been refractory to study in rats and mice, and are difficult to study in non-human primates.

This pathology manifests during the early stages of pregnancy, making it hard to predict and very difficult to study in humans (presymptomatic phase and lack of tissues access).

Yet, encounter complexes constitute only a minor population of the total complex, and are difficult to study (Berg et al. 1981; Schreiber and Fersht 1996; Gabdoulline and Wade 2002).

As the scope of our science understanding expands, systems are becoming more complex and more difficult to study, inevitably requiring more time.