How does trees interact with other organism

Look at the following answer choices and determine which belongs in the both category. testable, can be disproven explains natural phenomena, has evidence to support it prediction, tentative, one or more scientists working together well established, many different scientists working independently, highly reliable

Which zone within the open-ocean zone is home to the most organisms? deep zone surface zone intertidal zone transition zone

When a population split into two subgroups what is most likely to cause the subgroups to develop different traits?