Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 25.2, Problem 2CC
MAKE CONNECTlONS Describe how the origin of multicellularity in animals illustrates Darwin's concept of descent with modification (see Concept 19.2).
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Segmentation
Can be fused into specialized functional regions
Is seen in insects, worms, and their relatives
Is important in the evolution of increasing organismal disparity
Is seen in the Cnidaria (jellyfish and friends)
Is seen in vertebrates (animals with backbones, like you)
WRITE ABOUT A THEME: Organization You have seenmany examples of how form fits function at all levels of thebiological hierarchy. However, we can imagine forms thatwould function better than some forms actually found innature. For example, if the wings of a bird were not formedfrom its forelimbs, such a hypothetical bird could fly yet alsohold objects with its forelimbs. In a short essay (100–150words), use the concept of “evolution as tinkering” to explainwhy there are limits to the functionality of forms in nature.
Lab 10: Kingdom Animalia Introduction Animals all share some characteristics:
1) Multicellular
2) Heterotrophic
3) Their cells have no cell wall
4) At some time in their life they are motile.
There are many phyla within the animal Kingdom, and in this activity, you will explore these phyla by building a dichotomous key that will allow you to consider almost any animal and determine which phylum it belongs to.
Part 1: Organizing information for the dichotomous key 1) List the 9 animal phyla of macroscopic (visible) animals: Porifera, Cnidaria, Platyhelminthes, Nemotoda, Annelida, Arthropoda, Mollusca, Echinodermata, and Chordata. 2) Use on-line or library resources of your choice, to gather information about these 9 phyla.
a. Start by finding two example species per phylum to help tie into your previous knowledge about animal types. Write down these examples.
b. Make a list of characteristics that you could use that would help you tell these 9 phyla apart. The final goal is to build a…
Chapter 25 Solutions
Campbell Biology in Focus (2nd Edition)
Ch. 25.1 - Describe major events in the evolution of early...Ch. 25.1 - Explain why eukaryotes are said to be combination...Ch. 25.1 - Prob. 3CCCh. 25.2 - Summarize the evidence that choanoflagellates are...Ch. 25.2 - MAKE CONNECTlONS Describe how the origin of...Ch. 25.2 - Prob. 3CCCh. 25.3 - Briefly describe the organisms found in each of...Ch. 25.3 - MAKE CONNECTIONS Review Figures 7.2 and 8.5...Ch. 25.3 - Prob. 3CCCh. 25.4 - Justify the claim that photosynthetic protists are...
Ch. 25.4 - Prob. 2CCCh. 25.4 - Prob. 3CCCh. 25 - The oldest fossil eukaryote that can be resolved...Ch. 25 - Prob. 2TYUCh. 25 - Plastids that are surrounded by more than two...Ch. 25 - Prob. 4TYUCh. 25 - Prob. 5TYUCh. 25 - Based on the phylogenetic tree in Figure 25.9,...Ch. 25 - MAKE CONNECTIONS The bacterium Wolbachia is a...Ch. 25 - FOCUS ON EVOLUTION DRAW IT Medical researchers...Ch. 25 - FOCUS ON INTERACTIONS Organisms interact with each...Ch. 25 - SYNTHESIZE YOUR KNOWLEDGE These micrographs show...
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- 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_forwardPlease help to answer with explanation: Cnidaria (jelly fish) have neuromuscular (nerve net) cells in their ectoderm. These cells are important in evolution because they represent cells specializing to become a) the lungs, b) the cells forming a specialized tissue. c) the first tissue to perform photosynthesis d) tall are true, e) none are true.arrow_forwardJay Guide The human embryo and the embryos of other animals with backbones have gill slits. According to the modern evolutionary theory, this best supports the idea: Mark only one oval. That fish are our closest relatives All embryos breathe through their gills All animals with backbones are related by common ancestry All organisms have gill slits at an early stage in their developmentarrow_forward
- EVOLUTION LINK What is the common ground between evolutionary biologists and developmental biologists who have adopted the perspective known as Evo Devo?arrow_forwardGive typing answer with explanation and conclusion to all parts What evidence shows that the most recent common ancestor of chimpanzees and humans was much more arboreal than modern humans are? We spoke of paleoenvironmental processes that changed the ecological environmental conditions in Africa somewhere around 7 million years in Africa: which are they? How would have these processes might have selected for a less arboreal lifestyle in the human lineage? Why did the same changes not evolve in the chimpanzee lineage?arrow_forwardHomologous structures are evidence that O That the animals probably share a common ancestor O That all animals probably came from each other O That all animals probably share the exact same DNA O That all the animals are unrlatedarrow_forward
- Explain how the evolution of specific body structures enable species to specialise for specific environmental niches, using specific examples from this practical (your answer should be 100 words max).arrow_forwardPlace the evolutionary steps that led to complex multicellularity in the order in which they thought to have occurred. 1 v [ Choose ] differential gene expression in cells the ability to communicate between cells the ability to move molecules by bulk flow the ability of cells to stick to each other 3. [ Choose ] 4 [ Choose ] 2.arrow_forwardSee attached. 1. Which pair of animals in numbers 1-3 belongs to a common ancestral group? Explain your answer.2. Fossils and anatomical records both provide pieces of evidence of evolution. How do you determine the age of fossils of an Aurorazhdarcho micronyx and an Archeopterix?arrow_forward
- How can embryos help scientists understand evolution? Embryos go through various stages that suggest the animal’s evolutionary process. Embryos are frequently fossilized and illustrate change over time. Embryos provide evidence for which life forms existed at the same time. Embryos contain the code for all life on Earth.arrow_forwardEvolution in Humans 1) explain how differences in gene expression of genetically similar organism can result in different evolutionary outcomes 2) describe the evolution of symbolic thought in humansarrow_forwardAnswer according to phylogenetic tree for animal phyla 1. Which phyla are radically symmetrical? 2. Which phyla are coelomates? 3. Which phyla are triploblastic? Explain what triplobastic means. 4. Which phyla have segmented bodies and a closed blood system? 5. a) Differentiate between an exoskeleton and endoskeleton. b) Which phyla have these skeletons? c) Give one advantage and disadvantage of each of this skeletons 6. Which phylum did not hive rise to any other group of animals? 7. Name one feature of the chordates that make them different from the other phyla 8. What was the common ancestor of all animals?arrow_forward
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