Answer:
D. physical boundary
Explanation:
Google the himalayas as borders in south east asian countries, you'll clearly see that they exist as physical boundaries between nations such as Nepal and China.
Convenience products are purchased with little shopping effort. these products typically are purchased regularly, usually with little planning, and require wide distribution.
<h3>What are convenience products?</h3>
This is the economic name that is used to refer to those products that are known to be frequently bought by the people that make use of or consume them.
These products are usually gotten without making much plans for them. They are low priced products that may not really be differentiated from other products in the market.
Read more on convenience products here: brainly.com/question/15104975
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Answer:
the book will not move its own but it is removed by applying other external force
