Concept explainers
WRITE ABOUT A THEME: INTERACTIONS Animal life changed greatly during the Cambrian explosion, with some groups expanding in diversity and others declining. Write a Short essay (100-150 words) interpreting these events as feedback regulation at the level of the biological Community.
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Chapter 32 Solutions
Campbell Biology, Books a la Carte Plus Mastering Biology with eText -- Access Card Package (10th Edition)
Additional Science Textbook Solutions
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)
Human Anatomy & Physiology (2nd Edition)
Becker's World of the Cell (9th Edition)
Microbiology with Diseases by Body System (4th Edition)
Brock Biology of Microorganisms (14th Edition)
Anatomy & Physiology
- You have now studied three different types of anatomical structures. Homologous structures show individual variations on a common anatomical theme. These are seen in organisms that are closely related. 1. Give an example of a homologous structure from this activity: Analogous structures have very different anatomies but similar functions. These are seen in organismsthat are not necessarily closely related but live in similar environments and have similar adaptations. 2. Give an example of an analogous structure from this activity: Vestigial structures are anatomical remnants that were important in the organism's ancestors but are nolonger used in the same way. 3. Give an example of a vestigial structure from this activity:arrow_forwardFour organisms are analyzed for various biological features as described below. Plant Multicellular Fossils found in Fossils with Fossils with fruiting Fossils with stromatolites teeth bodies stomates A No Yes No No No B Yes No Yes No No Yes No No Yes No Yes No No No Yes Part A: Explain how to tell which major groups of living things these come from and how to tell whether they may come from an aquatic habitat or from a terrestrial habitat, if it is possible to tell. Part B: Decipher which organism comes from what major groups of organisms and explain how you deciphered this. B red 000 吕口 F3 F1 F2 O00 F4 F7 F8 % 2 3 6 8 W E R T * 00arrow_forwardAt what level of organization do humans and zebra mussels diverge? Question 1 options: Phylum Kingdom Domain Classarrow_forward
- Use the igure below, which shows the Tood web of an aquatic ecosystem, to anSwer the following questions: Killer whale Crabeater seal Elephant seal Adelie penguin Squid Leopard seal Cod / small animals and protists Algae Use the figure below, which shows the food web of an aquatic ecosystem, to answer the following questions: CMAC 1-In the food web above, there are eight food chains that include krill. In the space provided, identify all of the organisms in the order in which they occur in three of these eight food chains Food chain 1 Food chain 2 Food chain 3 3- Identify the most energy efficient food chain for the killer whale. Food chain 3- Draw am energy pyramid for the most energy efficient food chain for the killer whale . 4 2 I 3.arrow_forwardGive typing answer with explanation and conclusion Consider this claim: Changes in environmental conditions always result in new ecosystems and loss of biodiversity characterized by an increase in the number of some species, the evolution of new species, and the extinction of some species. Use what you have learned from the lesson, as well as reliable and reputable resources, to evaluate this claim. Use at least three examples from the lesson and other sources to support the valid ideas in the claim and refute the invalid?arrow_forwardSCENARIO: Ecologists have recently made an observation regarding a species of nematode (round worm) commonly found in Australian soils with two distinct phenotypes appearing, the mutant form appears to have increased cuticle formation. This species is a crucial part of their ecosystem’s food web and is a predator of many soil microbes. The divergent phenotype appears to negatively affect its predatory behaviour, which could have disastrous flow on effects to the rest of the ecosystem. Preliminary studies also indicate this phenotype has a genetic basis, so is not caused by infection. You have been tasked with uncovering the genetic basis of this phenotype. Q6. Given the phenotype leads to a negative impact on the nematode’s predatory behaviour, develop a hypothesis as to why this phenotype is increasing among the population (i.e. it is being positively selected for): Q7. Briefly describe an experiment you could use to test this hypothesis:arrow_forward
- SCENARIO: Ecologists have recently made an observation regarding a species of nematode (round worm) commonly found in Australian soils with two distinct phenotypes appearing, the mutant form appears to have increased cuticle formation. This species is a crucial part of their ecosystem’s food web and is a predator of many soil microbes. The divergent phenotype appears to negatively affect its predatory behaviour, which could have disastrous flow on effects to the rest of the ecosystem. Preliminary studies also indicate this phenotype has a genetic basis, so is not caused by infection. You have been tasked with uncovering the genetic basis of this phenotype. Q1. Given the phenotype blister nematode leads to a negative impact on the nematode’s predatory behaviour, develop a hypothesis as to why this phenotype is increasing among the population (i.e. it is being positively selected for): Q2. Briefly describe an experiment you could use to test this hypothesis:arrow_forward* Subscribe Identify 5 organisms (plants or animals) from the Paleozoic Era and relate them to an organism today. Did they evolve into this organism or are their similarities a coincidence? Feedback Filter by: All Threads varrow_forwardBriefly summarize this piece of textarrow_forward
- -How long is the time span between the appearance of free atmospheric oxygen and evidence of complex (multicellular) forms? -How much time is there between complex forms and the Cambrian Explosion?arrow_forwardLet’s see what you already know! For this activity, you are a palaeobiologist interested in reconstructing ancient ecosystems. You have searched the scientific literature and found 5 clues:1. The majority of the field site (~100 km2) is mostly covered with limestone. However, in one area younger mudstone rocks are preserved above the limestone.2. The limestone has many invertebrate fossils including starfish, sea urchins, and coral, but mostly has bivalve shells. 3. The limestone also has vertebrate fossils. Small shark teeth are sometimes found. A single elasmosaurid plesiosaur tooth was discovered. Amazingly, several coprolites (fossilised dung) have fish vertebrae found in them; one coprolite even has a feather inside!4. The mudstone is rich in tiny ‘microfossils’ that include:• Small mammalian teeth • Pollen from 29 different families of flowering plants: the most common families are Caesalpiniaceae (peacock flowers)5. The mudstone also has larger fossils, including:• Pelvic and…arrow_forwardPART II. FOSSILS DIRECTIONS: Examine the illustrations of the marine organisms shown below whose fossils make up part of the fossil record. These organisms are arranged from oldest to most recent. Draw an animal that might have been a transitional (intermediate) form between shown organisms. Then use the diagrams to answer the questions that follow. Organism 1 Organism 2 Organism 3 Organism 6 Organism 5 Organism 4 Illustrated by Mary Vienne M. Pascual 1. Describe one characteristic you see in organism 3 which might have had an advantage over organism 2. 1 2. How might these fossils provide evidence for evolution? 4arrow_forward
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage LearningBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningConcepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College