Fossil fuels, such as petroleum, are formed by the decomposition of living material. Large amounts of known oil reserves are located deep in the ground in deserts and tundra. How can you explain that we currently find the largest oil reserves in arid deserts?

Why is it important to reduce the number of chromosomes in half when forming gametes for sexual reproduction?

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.

Genetic disorders can result when sister chromatids fail to seperate properly. during what phase is this problem most likely to occur?