According to figure 2-1 , at what temperature do the two enzymes have the same amount of activity

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.

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 is d.) homologous; have mammary glands

the answer to your question is tooth decay.