Through time, the way people have obtained a sufficient food supply has changed. While variation across geographical areas is present, there are general global trends in how food is obtained or produced. In 3–5 sentences, discuss the factors that drove these changes.
In 2–3 sentences, explain the differentiating features of the major historical phases in human food procurement or production.
In one sentence, identify some challenges that may drive future changes in agriculture.

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a maximum–minimum thermometer. the scales are fahrenheit on the inside of the u and celsius on the outside. the current temperature is 23 degrees celsius, the maximum recorded is 25, and the minimum is 15, both read from the base of the small markers in each arm of the u tube. the bulbs are hidden by a plastic housing.

six's thermometer is a registering thermometer which can record the maximum and minimum temperatures reached over a period of time, for example 24 hours. it is used to record the extremes of temperature at a location, for instance in meteorology and horticulture. it was invented by a british scientist james six, born in canterbury, in 1780; [1] the same basic design remains in use.

it is also commonly known as a maximum–minimum, minimum–maximum, maxima–minima or minima–maxima thermometer, of which it is the earliest practical design.

the thermometer indicates the current temperature, and the highest and lowest temperatures since last reset.