What is Life? A Guide to Biology with Physiology
3rd Edition
ISBN: 9781464157745
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 23, Problem 8SA
Summary Introduction
To analyze:
Why the size of the brain and head have become more pronounced during human evolution.
Introduction:
Brain has a number of different sections, for different activities.
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Adaptations are physical or behavioral traits that help an organism survive in its environment. What are some of the adaptations in the evolution of hominins that allowed for the evolution of the genus Homo to evolve (eventually) into modern humans (Homo sapiens)? (Note: you don’t have to explain why these adaptations allowed the genus to evolve, just list some of the adaptations.)
Is evolution important to all living things, and why do we need to adapt to the ever-changing conditions in which we find ourselves?
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Chapter 23 Solutions
What is Life? A Guide to Biology with Physiology
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- Some people think that many of our uniquely human traits arose by sexual selection. Over thousands of years, women attracted to charming, witty men perhaps prompted the development of human intellect beyond what was necessary for mere survival. Men attracted to women with juvenile features may have shifted the species as a whole to be less hairy and softer featured than any of our simian relatives. Can you think of a way to test these hypotheses?arrow_forwardSome human traits may have arisen by sexual selection. Over thousands of years, women attracted to charming, witty men perhaps prompted the development of human intellect beyond what was necessary for mere survival. Men attracted to women with juvenile features may have shifted the species as a whole to be less hairy and softer featured than any of our simian relatives. Can you think of a way to test this hypothesis?arrow_forwardThe path of whale evolution has involved the reduction or loss of several traits that are still prominent in most other mammals. TRUE (1) or FALSE (2). In terrestrial mammals, the sense of smell (olfaction) involves receptor proteins encoded by a number of genes. Whales don't have a sense of smell underwater, but their genomes still contain copies (pseudogenes) of some of these olfactory genes in their genomes. Because they are still present in whales' genomes, these genes must serve some other function in whales. Whales have some vestigial features like muscles that are attached to external ears in other mammals, even though whales have lost their external ears. Humans also lost some traits (e.g., body fur) and also have some vestigial traits, such as a mechanism to cause fur to stand on end even though we are mostly hairless (i.e., arrector pili muscles that produce goosebumps). Some features like hindlimb buds and whiskers are observed…arrow_forward
- What is meant by biological evolution?arrow_forwardWhat are the genetic changes thatallow the repurposing of existing bodyparts during evolution? For example,how did bat wings evolve from arms?arrow_forwardThe first modern humans evolved in Africa. a) What are two kinds of evidence supporting that conclusion, one based on data from living individuals and one from some other source of data? b) What are some unique anatomic and behavioral traits that are unique to hominid species compared to primates, and to Homo sapiens in particular, compared to other hominid species?arrow_forward
- In many ways, modern human lifestyles are at odds with our bipedal locomotion. At no point in history have humans been as inactive as today (especially in developing nations), which has led to a number of physical ailments, such as obesity, loss of mobility, and low back pain. What are some other impacts of evolution on our species? What are some ways we can alleviate these problems?arrow_forwardWhat is evolution and why is a basic knowledge of evolution necessary?arrow_forwardThere are two hypotheses to explain the pattern of Human Evolution: 1) Progressive Evolution of a Single Lineage ; 2) Evolutionary Radiation Which of these hypotheses are supported by evidence, and briefly explain why? Please explain in detailsarrow_forward
- One compelling piece of evidence for human evolution is the fossil record, particularly the discovery of transitional fossils like Australopithecus afarensis. Lucy, discovered in 1974, provides an essential link between us humans today and our ape - like ancestors. Her head skeleton, especially the pelvis and leg bones, indicates that she walked upright, a key trait distinguishing early hominins from other primates. This evidence is compelling because it directly shows us physical adaptations in ancient species from millions of years ago that align with the evolutionary theory of bipedalism. Supporting this theory the gradual changes observed in the fossil record, from ape- like traits to more human-like features, offer concrete, sequentially proof of how humans have evolved over the years.arrow_forwardIf humans evolved from apes, why are there still apes?arrow_forwardWhat is Neil Shubin (the narrator) looking for? 2.What job does Neil have? 3.Fish were the first creatures with what trait? 4.When did the first mammals show up? 5.Sir Richard Owen was the first scientist to notice what skeletal pattern? 6.Instead of limbs fish have what? 7.Where did the paleontologists go for their first expedition? 8.What type of environment was the Canadian Arctic hundreds of millions of years ago? 9.In the early stages of development, all animals begin as what? 10. If you look at a fish and human embryo side by side, how similar do they look?arrow_forward
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