Heat shields on a space craft are necessary when it reenters the earth’s atmosphere because at the high speed of entry air will .

weathering is the answer.

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.

the answer would be knowledge about cars!