Drilling/digging costs money. More digging costs more money. Picking the location to dig/drill is important. What is the minimum number of sedimentary rock layers
necessary for a smart company on the surface to drill down through to get to the
Coal Layer (F)?

Dwarf galaxies are select one: a. relatively rare. b. not very bright c. mostly spiral shaped. d. none of these.

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

Ialready know the answers to these questions and they are on the attachment. but i just need to know why that answer is the correct one. plz asap! this is for a report that i need to email by 10!