The answer is D.
It is the most needed because if the waste of the body doesn't get removed then you will become very ill and possibly die.
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Answer:
Barrier.
Explanation:
The weather is called a barrier because it stops you from completing your task within the given time. With this weather condition, you are unable to complete your task due to unavailability of internet which is required for your task. Weather such as thunderstorm can disrupt the internet service to a specific area because thunderstorm can destroy whatever comes in its way so if thunderstorm prevent you from doing your task complete in a given time so it is a barrier.
Answer:
New species form by speciation, in which an ancestral population splits into two or more genetically distinct descendant populations. Speciation involves reproductive isolation of groups within the original population and accumulation of genetic differences between the two groups
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