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There many pens of many different sizes. Averaging all of them would be impossible as new pens are created every, single day.
There many pens of many different sizes. Averaging all of them would be impossible as new pens are created every, single day.
The size of a shadow has everything to do with placement of the light source, the object, and the background on which the shadow is cast. In general, if the light source is close to the object and the background is further away then the shadow is larger than the object. The opposite is true if the light source is further away. Another part of the equation has to do with angles. This is what we commonly observe happining to shadows at different times of the day; long shadows in the morning and evening and smaller shadows around the middle of the day.
Because of the position of the Sun during different times of the day
There's no set number ! Every foetus is different - movements are independent, random.