What is sedimentary rock? Group of answer choices

Where fossils usually form

Made of sand and shells

Is compacted or pushed together

All of these

Using mr smith and his id, identify two potential internal validity threats that might affect the a—b design. tell me how that threat might impact conclusions in the a—b design. note #1: you cannot use maturation (since i already did that one for note #2: there are some mr smith id threats that won’t have much impact in a single case design.