Free points chupapi muneyo you heard that before?

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

The tea bush grows best in east asia’s zones.a) arid and semi-arid.b) arid and tropical .c) tropical and subtropical.d) humid continental and subtropical.

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.