Concept explainers
To place:
The first australopithecines and first hominoids in the given time line.
Introduction:
The lineage that led to humans split off from the other African apes occurred sometime between 8 and 5 mya. Hominins include humans and all their extinct relatives. The evolutionary changes in hominoids led to bipedalism in hominins. The earliest fossils of species that show some degree of bipedalism are 6- 7 million years old.
Answer to Problem 4MI
Explanation of Solution
Hominoid includes all non- monkey anthropoids such as the living and extinct gibbons, orangutans, chimpanzees, gorillas and humans.The oldest hominoid fossil appears in about 25 mya at the beginning of Miocene. These hominoids retained some ancestral primate features. Hominoids are the largest of the primates and they have the largest brain size in relation to their body size. They have semi- upright or upright posture and except for hominins they have arms longer than their legs. The oldest known hominoid fossil is from the genus Proconsul .
The first hominins that were truly bipedal were the australopithecines. They were small and had apelike brains and jaws. Their teeth and limb joints resembled those of humans.They lived in east- central and southern part of Africa between 4.2 and 1 mya.
Additional Science Textbook Solutions
Fundamentals of Anatomy & Physiology (11th Edition)
Fundamentals of Anatomy & Physiology Plus Mastering A&P with eText - Access Card Package (10th Edition) (New A&P Titles by Ric Martini and Judi Nath)
Essentials of Genetics (9th Edition) - Standalone book
Microbiology: An Introduction (13th Edition)
Brock Biology of Microorganisms (14th Edition)
- Human Anatomy & Physiology (11th Edition)BiologyISBN:9780134580999Author:Elaine N. Marieb, Katja N. HoehnPublisher:PEARSONBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxAnatomy & PhysiologyBiologyISBN:9781259398629Author:McKinley, Michael P., O'loughlin, Valerie Dean, Bidle, Theresa StouterPublisher:Mcgraw Hill Education,
- Molecular Biology of the Cell (Sixth Edition)BiologyISBN:9780815344322Author:Bruce Alberts, Alexander D. Johnson, Julian Lewis, David Morgan, Martin Raff, Keith Roberts, Peter WalterPublisher:W. W. Norton & CompanyLaboratory Manual For Human Anatomy & PhysiologyBiologyISBN:9781260159363Author:Martin, Terry R., Prentice-craver, CynthiaPublisher:McGraw-Hill Publishing Co.Inquiry Into Life (16th Edition)BiologyISBN:9781260231700Author:Sylvia S. Mader, Michael WindelspechtPublisher:McGraw Hill Education