Water near the equator is warmer than water at the poles. Which sentence explains why? A. Deep-sea vents pump steam into oceans unevenly.
B. Upwellings spew warm water toward the equator.
C. The sun heats Earth and its oceans unevenly.
D. Dense, salty water tends to hold more heat.

dense,salty water tends to hold more heat

d. sodium chloride ions.

the diploid number of chromosomes is sometimes represented by the symbol 2n. for the fruit fly, the diploid number is 8, which can be written as 2n = 8, where n represents twice the number of chromosomes in a sperm or egg cell.