What type of gene is only expressed if there are two genes of that type

The use of dna as evidence in criminal investigations became possible because of the

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

Which of the following produces carbon dioxide? a. plants b. animals c. decomposers d. all of the above