Most discussions of the factors contributing to improvements in public health greatly underestimate the influence of the values held by individuals. This influence is indicated by the fact that the astonishing decline in mortality from infectious disease during the past century was primarily due to an improvement in living conditions. To a substantial degree, these improvements depended on the emphasis by an increasing share of the population on cleanliness, prudence, and moderation.

The main point of the passage is made primarily by

(A) analyzing existing data on medical practices and health outcomes

(B) presenting a set of related cause-and-effect assertions

(C) applying several general principles to a specific case

(D) presenting a general observation and supporting it with several specific examples?B?

(E) refuting in detail a commonly accepted argument

A peculiar feature of the embryonic mammalian circulatory system is that in the area of the heart the cells adhere to one another, beating in unison and adopting specialized orientations exclusive of one another.

(A) beating in unison and adopting

(B) they beat in unison while adopting

(C) beat in unison, and adopt

(D) beating in unison yet adopting?D?

(E) even though they beat in unison and adopt