Earth’s magnetic field is generated by the?
a. mantle
b. lithosphere
c. outer core
d. inner core
e. crust

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?

How does the author's purpose in this passage differ from an author writing about her personal struggle living with asthma?

Which would best keep the oxygen cycle stable? a. cutting down jungles to create farmland b. eliminating parks in large cities c. dumping toxic chemicals into the ocean d. reducing the amount of deforestation d. reducing the amount of deforestation