What natural disasters are linked to each other?

Aboy with an extra x chromosome probably has which of the following syndromes?

What is the compliment dna strand to the following sequence: ttgactaggcta

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