1. For how long has there been life on Earth?2. For what percentage of time has life existed on Earth (round to the nearest wholenumber)?3. For about how many years of geological time have humans existed on Earth?4. For about how many years of geological time have the dinosaurs existed on Earth?5. Did dinosaurs exist at the same time as humans?6. How do scientists determine when an era begins and when it ends?7. What is the purpose of making a geological timeline? Geologic time scale, 650 million years ago to the presenteraperiodeventsQuaternaryevolution of humans2.6Neogenemammals diversify50Paleogeneextinction of dinosaurs100first primatesCretaceousfirst flowering plants150first birdsJurassicdinosaurs diversify200first mammalsTriassicfirst dinosaurs250major extinctionsPermianreptiles diversify300first reptilesPennsylvanianscale treesseed fernsMississippian350first amphibiansDevonianjawed fishes diversify400-Silurianfirst vascular land plants450sudden diversificationOrdovicianof metazoan families500first fishesCambrianfirst chordates550first skeletal elementsfirst soft-bodied metazoansfirst animal traces600650 LO2010 Encyc lopada Britannica, Inc.milions of years agoLate ProterozoicDIozoejedMesozoic-uoquesnojoj

The geological time scale depicts the various time periods throughout the history of the earth…

1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth?

1. For how long has there been life on Earth? 2. For what percentage of time has life existed on Earth (round to the nearest whole number)? 3. For about how many years of geological time have humans existed on Earth? 4. For about how many years of geological time have the dinosaurs existed on Earth?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter27: Introduction To Animal Diversity

Section: Chapter Questions

Problem 13RQ: Which of the following periods is the earliest during which animals may have appeared? Ordovician...

See similar textbooks

Similar questions

Which of the following periods is the earliest during which animals may have appeared? Ordovician period Cambrian period Ediacaran period Cryogenian period
The diversity of modern vertebrates was shaped in partby mass extinctions. The most severe extinction eventwe know of occured at the border between the Permianand Triassic periods about 250 million years ago. Anestimated 96 percent of the marine species and 70 percentof land species disappeared in what is sometimes called“The Great Dying.” The cause of this mass extinctionremains under investigation. Suggested causes includean asteroid impact, extreme volcanic activity, or a sudden release of carbon dioxide from deposits on the sea floor. Which groups of vertebrates were present when this mass extinction event occurred? Which evolvedafterward?
Taphonomy tells us ab0ut preservati0n biases in the fossil rec0rd. What kind of biases affect 0ur understanding 0f the large animals 0f the Triassic, Jurassic, and Cretaceous? (a short list with explanations or 2-3 short paragraphs) need help asap, thank you in advance
Propliopithecids vs. Parapithecids. Adapids and Omomyids. Dryopithecus and Oreopithecus. With the exception of Gigantopithecus, many students struggle to differentiate between the various fossil primates. So, let's write about them, have a little fun, and help embed them in our brains. Create an original comic or storyboard that illustrates one of the fossil primates. Unlike the Primate Profiles, this is NOT meant to be a research project! This is meant to be a study tool for you. You should build comics primarily, if not exclusively.
Approx how many mass extinction events occurred throughout the evolutionary history of animals
MAKE CONNECTIONS Many new animal body plansemerged during and after the Cambrian explosion. Incontrast, cnidarians today retain the same diploblastic,radial body plan found in cnidarians 560 million yearsago. Are cnidarians therefore less successful or less “highlyevolved” than other animal groups? Explain.(See Concepts 25.3 and 25.6.)
The appearance of the first hominoids dates to the ___________ period. Triassic Jurassic Cretaceous Tertiary Quaternary
''Cambrian Explosion'' What contributed to this explosion of life? What were Earth conditions like and in what ways were the multicellular animals becoming different to those of the Ediacaran Period? Additionally, which form(s) of life were likely to be human ancestors during the Cambrian?
Why was the Mesozoic era extinction significant to the history of mammals? a. As photosynthesis slowed, meat-eating mammals prevailed. b. Fewer plankton species meant more open ocean ecosystems for large, aquatic mammals. c. Dinosaur extinctions opened up new habitats to mammals. d. Only the smartest primates knew how to survive the extinction.
ZOOLOGY TOPICBased on the illustration below (Figure 1.1, describe how Homo sapiens isrelated to other animals such as the mammals and bony fishes (Osteichthyes).
Which of the following periods is the earliest during which animals may have appeared? a. Ordovician period b. Cambrian period c. Ediacaran period d. Cryogenian period
Scientists who study forms of marine life that lived more than200 million years ago usually obtain fossils not from the sea floor, butfrom areas that were once under sea and have been uplifted onto thecontinents. Why?