Answer: a. Often external physical work cannot be easily measured.
Explanation:
Physical work or manual labor is done by people as a part of their daily routine. This involves the movement of muscles and bones to a limited to considerable extent. It involves the activities like cooking, cleaning and moping, riding cycle and other activities which requires labor.
These physical works cannot be considered as a part of exercise as these are not considerably measured. But they can be included as a part of exercise as in both cases manual labor is required.
Hello!
The blood pressure is supposed to be stable at all times to prevent strokes or other deadly effects. You measure the blood pressure with a sphygmomanometer around the arm and listen to the pulse. When completed, you would write the blood pressure like so: 120 over 80. If you write it any other way, it would be incorrect, so you measure the first sound first, then when the sound stopped and remember to write "over."
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The answer is hybridization.
Hybridization represents crossbreeding of two different breeds, species or genera. It results in hybrids with some characteristics from one breed/species/genera and some from the other one. It could also have some new characteristics. For, example, a crossbreed of an orange and a grapefruit will have some characteristics of the orange and some of the grapefruit. This is an example of crossbreeding between two species of the same genera (Citrus) - orange is Citrus sinensis and grapefruit is Citrus paradisi.
I think the answer is in the stomach