Construct a food web, and explain the interactions of the organisms that compose it

The eco-system of the oceans of the world is controlled by the marine food chain. The marine scientists call the ocean food chain as marine food web. The reason is many of the marine species nourish on more than one kind of creature or food. There are many marine inmates who eat the members of their own group. 

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answer: collecting information/data

reason: the student is going around and asking people questions to collect data

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hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds