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Chapter I covers animal husbandry and plant breeding, going back to ancient Egypt. Darwin discusses contemporary opinions on the origins of different breeds under cultivation to argue that many have been produced from common ancestors by selective breeding. As an illustration of artificial selection, he describes fancy pigeon breeding, noting that "[t]he diversity of the breeds is something astonishing", yet all were descended from one species of rock pigeon. Darwin saw two distinct kinds of variation: (1) rare abrupt changes he called "sports" or "monstrosities" (example: ancon sheep with short legs), and (2) ubiquitous small differences (example: slightly shorter or longer bill of pigeons). Both types of hereditary changes can be used by breeders. However, for Darwin the small changes were most important in evolution.

From what does Darwin assert all pigeons are descended?
Answer: one species of rock pigeon
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When the White House is controlled by the House majority party, then the House minority leader assumes a larger role in formulating alternatives to executive branch initiatives and in acting as a national spokesperson for his or her party. "As Minority Leader during [President Lyndon Johnson's] Democratic administration, my responsibility has been to propose Republican alternatives," said Minority Leader Gerald Ford, R-MI. Greatly outnumbered in the House, Minority Leader Ford devised a political strategy that allowed Republicans to offer their alternatives in a manner that provided them political protection. As Ford explained:

What did Ford's alternatives provide for republican's?
Answer: political protection
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As the playing of gramophone records causes gradual degradation of the recording, they are best preserved by transferring them onto other media and playing the records as rarely as possible. They need to be stored on edge, and do best under environmental conditions that most humans would find comfortable. The medium needs to be kept clean, but alcohol should only be used on PVC or optical media, not on 78s.[citation needed] The equipment for playback of certain formats (e.g., 16 and 78 rpm) is manufactured only in small quantities, leading to increased difficulty in finding equipment to play the recordings.

Should alcohol be used to clean gramophone recordings?
Answer:
alcohol should only be used on PVC or optical media