Ateam of archaeologists excavating a sedimentary rock layer come across some primitive hunting tools used by early humans. as the dig progresses, they unearth the fossilized remains of dinosaur from another layer of the sedimentary rock. why do these discoveries indicate that the rocks were formed over millions of years

Which best describes how the common cold spreads in the human body? a bacteria burst out of normal cells killing them b viruses replicate inside respiratory cells c bacteria inject dna into normal cells d viruses insert dna into bacteria

The bacteria found in soil is usually harmful and measures are taken to remove any traces of microorganisms. true or false

The diagram below shows the layers of a rock having a trilobite: a rock column labeled rock is shown. the column has three layers. the bottommost layer of the rock has one shaded rhomboid shape, the middle layer has a rhombus with a diagonal along with two identical organisms marked as, trilobite, in the key, the top layer has two semicircles. a key is shown on the right side of the diagram. the shaded rhombus is marked as a, the rhombus with the diagonal is marked as b, the semicircle is marked as c which statement about the rock fossils is true?