Which of these is a result of increased biodiversity in an ecosystem

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

Hybrid instruments that play sounds that are part sampled and part synthesized are known as:

Group control group #1 experimental group yes yes yes control group #2 no new drug orange juice bed rest no yes no yes ves which of the following is the best explanation of why a second control group was included in this experiment? o a. to provide the volunteers in the study with something to drink o b. to prove that the common cold cannot be cured c. to confuse anyone who is trying to steal their new drug and sell it as their own invention o d. to researchers conclude that results are related to the new drug and not to the orange juice submit e previous