Proteins contain ___ different amino acids, whereas DNA
and RNA are composed
of different ___ nucleotides.

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.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Which step is not included in the step approach to calculating the greatest common divisor?