The heart along with the rest of the circulatory system could be compared to
a major transportation system in a city
a chemical manufacturing plant
the police department in a city
a recycling plant

the answer is 1. photosynthesis. glad to

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.