As more and more people exist on Earth, which of the following will DECLINE?
5 points
The amount of construction materials required on a yearly basis
The amount of solar energy that is retained in the troposphere and in the atmosphere
as a whole.
The area available to wildlife and other animals.
The use of energy needed to sustain communication and residential needs.

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.

How can we use spectral lines of light coming from the superclusters to identify which is receding from earth at the slowest rate.

24. how are vaccines used to keep people healthy?