The answer is, b. other substances
Political if you are talking about where the country meet another and its a natural boundary if it is physical like a river or mountain range
Answer: South America is generally considered a continent forming the southern portion of the landmass of the Americas, south and east of the Panama–Colombia border by most authorities, or south and east of the Panama Canal by some. ... The Caribbean territories are grouped with North America.
Answer:with a boat or plane
Explanation:
I'd say its B. able to develop self-contained ecosystems.
