The effects of an environmental chemical challenge on assimilation can thus manifest themselves either as changes in external activity (search volume) or as changes in internal physiology (handling time).
Although changes in φ max will result in proportional changes in φ, changes in external activity (and, hence, in F H) will produce significant changes in φ only when food is not in abundance (i.e., when F is not large compared with F H). Broadly speaking, chemical challenges seem likely to increase ζ and decrease φ in any given environment.
Here's a typical scenario that arises from not realizing this important truth: First, you gradually or suddenly become aware that you have some form of imbalance in the external activities or commitments of your life.
We find that firms that excel in diversification of external activities (in terms of different types of partners) perform best.
There are many external activities in which families can choose to participate.
In order to keep our own skills up to date, we take part in a wide programme of external activities.
The player/bettor in all cases is relying on external activities over which he/she has no control.
To come to my second point: The German philosopher and sociologist Georg Simmel wrote in 1900 in his book "Philosophy of Money": "The lack of something definite in the center of the soul impels us to search for momentary satisfaction in ever-new stimulations, sensations and external activities.
"We are very concerned that, as an unintended consequence of this proposal, many people with a learning disability will be denied opportunities to meet with friends and families, participate in external social activities and engage with their local communities".
A distinction is made between internal and external professional development: the former involves further training within the school setting whereas the latter comprises participation in external training activities.
