'Climatic variations' and 'Human activities' can be regarded as the two main causes of desertification. removal of the natural vegetation cover（by taking too much fuel wood）, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity.
The answer is either sugar or tobacco as they were both essential crops to the Caribbean Islands economy.
Answer:
The Panama canal
Explanation:
Opened in 1914, the Panama canal allows maritime traffic to travel between the Pacific and Atlantic oceans very rapidly through a system of locks (2 on the Pacific side, one in the Atlantic side), and the boats pass through an artificial lake crossing the whole country of Panama.
It takes just a few hours to cross from one side to the other, while it would take weeks to go down to the tip of South America and back up.
In 2016, the canal opened new locks, that can receive larger boats.
The phrase that compares a trace fossil to a fossil that forms as a result of an entire organism being trapped in amber is D. Both can possibly be used to study the organism's size. relative age of a rock.
<h3>What is a fossil?</h3>
A fossil is a remnant, impression, or trace of an animal or plant of a past geologic age that has been preserved in Earth's crust.
In this case, the phrase that compares a trace fossil to a fossil that forms as a result of an entire organism being trapped in amber is that both can possibly be used to study the organism's size. relative age of a rock.
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