The 
would enable a woman to assess a man's level of commitment, detect the existence of prior commitments to other women or children, and simultaneously signal to the man her sexual fidelity.
The second sentence, "The science director's assistant placed the order yesterday afternoon," is written in active voice.
In an economic market system, where there is competition, the supply and demand of a good or service determines the price and vice versa. Thus, in situations where the price increases, the quantity offered tends to increase, because the offerers have a higher profit perspective. On the other hand, demand tends to decrease, as consumers perceive the price increase and decrease the demanded quantity. Conversely, in situations where the price goes down, consumers have a spur to buy more, but the bidders tend to shrink the amount offered because their prospects for profit diminish. If market mechanisms prevail, the economy tends to find an equilibrium price at which the supply and demand for paraffins will be equal.
It has a big impact on how a message is received it is false
My country tis of thee,
Sweet land of liberty,
Of thee I sing.
Land where my fathers died!
Land of the Pilgrim's pride!
From every mountain side,
Let freedom ring!
('Tis of Thee)
Comes from that song, America was formed by pilgrims. The were proud that they formed a free country so it is Pilgrims Pride.
