In what way is petroleum, a fossil fuel, distributed on Earth? (Is it evenly, with most places having very little,
unevenly, with some places having none
evenly, with most places having a lot
unevenly, but with all places having at least some)

The health, management and conservation of biodiversity, is a challenge facing ecosystems worldwide. the major factors that affect the health and function of the great barrier reef are climate change and pollution. which question investigates the effects of a biotic factor on the reef ecosystem?

Which heredity condition causes a buildup of mucus in lungs and pancreas? a. cystic fibrosis b. heart disease c. huntington's disease d. sickle cell anemia

Which feature would you expect to find in a population in which sexual selection depends on male competition?