I need the answers to this test ASAP.

The answers that have a <- next to it is my answer.

1. Under which of the following conditions would a fossil most likely form? (1point)
   

AA living thing dies and sediment is very slowly deposited on top of i’s body.

BA living thing dies and sediment quickly covers its body. <-

CA living thing dies and its skeleton is left to the elements.

DA living thing dies and a radioactive element breaks down its body.

1. If you were looking for an example of a trace fossil, for which of the following might you search? (1point)
   

AFootprints and trails <-

BA whole body preserved in rock

CDinosaur teeth

DA hardened mineral sample

1. What does the law of superposition tell about the relative ages of rocks? (1point)
   

AThat the deeper you go into rock layers, the older the rocks are <-

BThat the deeper you go into rock layer, the younger the rocks are

CThat the oldest rock layer is always on top

DThat the oldest rock layer is always undisturbed

1. After a rock layer is eroded, which additional event must occur to create an unconformity, or gap, in the geologic record? (1 point)
   

AAn earthquake or motion along a fault

BNew sediment deposits build up on the eroded area <-

CRadioactive decay along a fault

DA volcanic eruption near the eroded area

1. Radioactive decay occurs when atoms (1 point)
   

ALose mass

BJoin with atoms of another element

CBreak down to form atoms of another element <-

DAre exposed to chemical weathering

1. If you were to consult the geological time scale for when the first vertebrates evolved, where would you look? (1 point)
   

AIn the section for the Ordovician period of the Paleozoic era <-

BIn the section for the Quaternary period of the Cenozoic era

CIn the section for the Triassic period of the Mesozoic era

DIn the section for Precambrian time

1. Earth’s atmosphere, oceans, and continents began to form during the first several hundred years of (1 point)
   

APrecambrian time

BThe Paleozoic

CThe Mesozoic era <-

DThe Cenozoic era

1. During the Devonian period, animals that could live on land began to evolve. These animals still spent part of their lives in the water. What were these animals called?
   

ATrilobites

BReptiles <-

CAmphibians

DDinosaurs

1. Which of the following events occurred during the Mesozoic era? (1 point)
   

ADinosaurs became common on land <-

BWhales and dolphins evolved in the oceans

CReptiles evolved on land

DThe supercontinent Pangea formed

1. Which of the following vertebrates had the chance to become abundant after the dinosaurs became extinct? (1 point)
   

AWooly mammoths

Bamphibians

Cmammals

Dreptiles <-

1. Which of the following organisms is not extinct? (1 point)
   

AThe dodo bird

BThe saber-toothed tiger

CThe saltwater crocodile <-

DThe Carolina parakeet

1. During which section of the geologic time scale did the first modern humans evolve? (1 point)
   

ADuring the Paleogene period of the Cenozoic era

BDuring the Quaternary period of the Cenozoic era <-

CDuring the Cretaceous period of the Mesozoic era

DDuring the Precambrian time

1. If the geologist found two fossils of different species buried next to each other in a rock layer, he or she might hypothesize that the two organisms may have been alive during the same period.
   

ATrue <-

BFalse

1. A species might become extinct when a disastrous event, such as a meteorite impact, occurs. (1 point)
   

ATrue <-

BFalse

Short answer

1. Define the geologic time scale and explain why geologists use it to show earth’s history. (1 point)
   
   

The geologic time scale is a system of chronological measurement that narrates stratigraphy to time, and is used by geologists, paleontologists, and other earth scientists to define the timing and relationships amid events that have arisen throughout Earth's history.