6.1 What does the term "Dead rock" mean to scientists?

thymine. in rna, thymine is replace by uracil

of those who start drinking before they're 15 will develop alcohol dependence

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.

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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