The word that describes an organism that has two different alleles for a trait is heterozygous.
Exponential growth of a population start to slow down when there is a competition for resources.
An environmental niche plays a big role in the population decline rate. We must think of an environmental niche as a profession for organisms (what it does for the environment, how it responds, how resources are used, etc.) when a niche is occupied by multiple species competition amongst them occur.
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Your answer is:The metric system is based on multiples of 10.
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