Which statements about ecosystems are true

If scientists only detect p waves in a certain layer of earths interior what does that tell us?

Can someone answer all these questions i need it done by tonight. once again

Venezuela’s economy relies most heavily on which of the followingvenezuela’s economy relies most heavily on which of the following? a. oil reserves in places such as the eastern llanos b. cattle ranching in the grasslands c. fertile farmland in the andean highlands d. coffee plantations in mountainous areas