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How would YOU define this word or term?

What is a group of organisms that are closely related and share similar characteristics

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

2. which is the last step in the scientific method?