The results would vary between observing a population directly as opposed to observing them indirectly in a way that you will miss some factors, particularly, those observable factors, such as their daily and actual behavior. Hope this answers your question.
Direct observations are made on subjects by recording the behaviours they exhibit in their natural setting. The researcher can either be physically present to record these observations using a camera or can hide to avoid any interference in the data gathering process. Example, watching or recording a bird chirp.
Indirect observation involves recording the traces left by the subject to understand the reason behind the behaviours exhibited by a subject. Example, observing the distribution of bird droppings to figure out their movement.
Thus, a direct observation will help identify the behaviours in a population and an indirect observation will establish the reason behind the observed behaviours in the population.
The double helix is a description of the molecular shape of a double-stranded DNA molecule. In 1953, Francis Crick and James Watson first described the molecular structure of DNA, which they called a "double helix," in the journal Nature.
