The logistic growth model describes a maximum population siz…

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The lоgistic grоwth mоdel describes а mаximum populаtion size that is

The lоgistic grоwth mоdel describes а mаximum populаtion size that is

Anоther sign stimulus, оf cоurse, is sound. A mаle bird’s song аttrаcts females and repels competitors. Thus, it acts as a signal to birds of the same species. Male grasshoppers also attract females with a song. The Ephippizer bitterensis, a grasshopper found along the Mediterranean coast of France, uses an organ borne on its back to produce a strident sound. Modified wing-like structures are scraped against each other to produce thissound, which is then amplified by a small shell. When females hear this sound, they scramble [move quickly] toward it, climbing over any obstacles that are in their way, and speeding up as they come close to their mates. Scientists who have studied the sound made by the Ephippizer bitterensis have found that the females respond to almost any sharp sound, even hand clapping. Copying the exact sound is not necessary; what matters is the sharpness and the quickness with which the sound is interrupted and resumed. It can be inferred that a female grasshopper might be most attracted to

Nаncy Shippen wаs а prоduct оf Philadelphia’s best lineage. Bоrn in 1763 as a privileged daughter of an upper-class family, her duty was to blossom into a charming woman, admired for her beauty and social graces rather than her intellect. Nancy’s education consisted of the refinement of skills that would please and entertain—dancing, cultivating her voice, playing musical instruments, painting on delicate china, and producing pieces of decorative needlework. Had Nancy shown any interest in politics, an exclusively masculine preserve, she would have shocked everyone, including her father, William Shippen. Shippen was a noted local physician who espoused independence in 1776, and where he led, his family followed. Indeed, he was a proud father in 1777 when, at his urging, Nancy displayed her patriotic virtue by sewing shirt ruffles for General Washington. Nancy had two male tyrants in her life. The first was her father. He forced her into marriage with Henry Livingston in 1781. Henry was the son of one of New York’s most powerful and wealthy families. The man she truly loved had only “honorable expectations” of a respectable income. So her father insisted that Nancy wed Livingston. The rejected suitor wanted to know “for what reason in this free country a lady must be married in a hurry and given up to a man whom she dislikes.” None of the Shippens responded. In truth, the answer was that Nancy legally belonged to her father until she became the property of the second tyrant in her life—her husband. The marriage was a disaster, most likely because Henry was an adulterer. Nancy eventually took her baby daughter and moved back to her family. She wanted full custody of the child, who by law was the property of her husband. Henry made it clear that he would never give up his legal rights to his daughter, should Nancy embarrass him in public by seeking a bill of divorcement. Even if she had defied him, divorce bills were very hard to get because they involved proving adultery or desertion. To keep actual custody of her daughter, Nancy accepted her entrapment and moved back with Henry. Several years later, however, Henry relented and arranged for a divorce, but by that time, Nancy’s spirit was broken. The former belle of Philadelphia society lived on unhappily in hermitlike fashion until her death in 1841. Having been so favored at birth, her adult years were a personal tragedy, primarily because of her legal dependence on the will of two men. (Martin et al., pp. 184–185) According to the selection, William Shippen was proud of his daughter because