1. radioactive decay occurs when atoms
A- lose mass *
B- join with atoms of another element
C- break down to form atoms of another element
D- are exposed to chemical weathering
2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would you look?
A- in the section for the Ordovician period of the paleozoic era.
B- in the section for the quaternary period of the cenozoic era.
C- in the section for the triassic period of the mesozoic era.
D- in the section for precambrian time. *
3. Earths atmosphere, oceans, and continents began to form during the first several hundred million years of.
A- precambrian time
B- the paleozoic era.
C- the mesozoic era *
D- the cenozoic era
4. During the devonian period, animals that could live on land began to evolve. these animals still spent part of there lives in the water. what where these animals called?
A- trilobites.
B- reptiles.
C- amphibians.
D- dinosaur. *
5. which of the following events occurred during the mesozoic era?
A- dinosaurs became common on lane. *
B- whales and dolphins evolved in the ocean.
C- reptiles evolved on land.
D- the supercontinent Pangaea formed.
6. which of the following vertebrates had the chance to become abundant after the dinosaurs became extinct?
A- woolly mammoths.
B- amphibians.
C- mammals. *
D- reptiles.
7. which of the following organisms is not extinct?
A- the dodo bird. *
B- the saber-tooth tiger.
C- the saltwater crocodile.
D- the Carolina parakeet.
8. During which section of the geologic time scale did the first modern humans evolved?
A- during the paleogene period of the cenozoic era.
B- during the quaternary period of the Cenozoic era.
C- during the cretaceous period of the mesozoic era.
D- during precambrian time. *
9. if a geologist found two fossil 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 time period?
-True *
-False
10. a species might become extinct when a disastrous event, such as a meteorite impact, occurs.
-True *
-False
Please help anyone?
1. The correct answer is A- lose mass. Radioactive decay occurs when the nucleus of an atom loses particles, which can include protons, neutrons, or electrons. This loss of particles results in a change in the atomic composition of the atom.
2. To consult the geologic time scale for when the first vertebrates evolved, you would look in the section for D- in the section for precambrian time. The Precambrian time is the longest span of Earth's history, encompassing about 4.6 billion years. It is divided into three eons: the Hadean, Archean, and Proterozoic. The first vertebrates, such as fish, emerged during the late Precambrian period.
3. Earth's atmosphere, oceans, and continents began to form during the first several hundred million years of C- the mesozoic era. The Mesozoic era is a geologic era that spans from about 252 to 66 million years ago. It is often referred to as the "Age of Reptiles" because dinosaurs were the dominant land animals during this time. Additionally, important geological events like the breakup of the supercontinent Pangaea occurred.
4. During the Devonian period, animals that could live on land began to evolve. These animals still spent part of their lives in the water. They were called C- amphibians. Amphibians are a group of vertebrate animals that can live both on land and in water. They are often referred to as the "first land vertebrates" because they were among the first animals to adapt to life outside of water.
5. The event that occurred during the Mesozoic era was A- dinosaurs became common on land. The Mesozoic era is divided into three periods: the Triassic, Jurassic, and Cretaceous. This era is often referred to as the "Age of Dinosaurs" because dinosaurs were the dominant land animals during this time. They evolved and diversified throughout the Mesozoic era.
6. After the dinosaurs became extinct, the vertebrates that had the chance to become abundant were C- mammals. Mammals are a group of vertebrate animals characterized by the presence of mammary glands and the ability to nurse their young with milk. After the extinction of the dinosaurs, mammals began to diversify and occupy ecological niches that were previously dominated by dinosaurs.
7. The organism that is not extinct is A- the dodo bird. The dodo bird, scientifically known as Raphus cucullatus, was a flightless bird native to the island of Mauritius. It became extinct in the late 17th century due to human activities, including hunting and habitat destruction. However, the other options, such as the saber-tooth tiger, Carolina parakeet, and saltwater crocodile, are extinct.
8. The first modern humans evolved during the section of the geologic time scale known as B- during the quaternary period of the Cenozoic era. The Cenozoic era is the most recent era of geological time, which began about 66 million years ago and continues to the present. The quaternary period is the latest period within the Cenozoic era and includes the present-day. Homo sapiens, the first modern humans, evolved during this period.
9. If a 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 time period. The statement is True. The presence of multiple species of fossils in the same rock layer suggests that these organisms coexisted in the same geological time period. Fossils are usually found in layers of sedimentary rock, which form over long periods of time, and can provide evidence of past environments and the organisms that lived in them.
10. The statement "a species might become extinct when a disastrous event, such as a meteorite impact, occurs" is True. Disastrous events such as meteorite impacts, volcanic eruptions, or climate change can lead to mass extinctions. These events can cause significant disruptions to ecosystems, altering habitats, and causing widespread extinction of species. One of the most well-known mass extinctions in history was the extinction of the dinosaurs, believed to have been caused by a large meteorite impact.