Saclike membranes that contain chlorophyll are known as

In dna, only the_ varies from one nucleotide to another. base phosphate sugar amino acid

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.

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?