Scientists seeking to determine which molecule is responsible for the transmission of characteristics from one generation to the next knew that the molecules must (1) copy itself precisely (2) be stable but able to be changed and (3) be complex enough to determine the organism’s phenotype. a. explain how dna meets each of the three criteria stated above. b. select one of the criteria stated above and describe experimental evidence used to determine that dna is the hereditary material.

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?

African penguins, which inhabit the coasts of southern africa, were classified as an endangered species in 2010. two significant threats to their survival are ecosystem damage from oil spills and overfishing by humans. overfishing depletes the food supply of african penguins. the best method to reduce the threat of overfishing would be to . the risk of oil spills could be reduced by increasing the use of , which should oil consumption. if an oil spill does occur, could be used to remove the oil so the ecosystem may more quickly recover.

Why has two different alleles for the same trait?