03:37Animal Classification | Evolution | Biology | FuseSchoolFuseSchool - Global Education888views1rank
Multiple ChoiceWhich of the listed characteristics is shared by plants, fungi, and animals? 1695views
Multiple ChoiceAnimals probably evolved from colonial protists. How do animals differ from these protist ancestors? 1523views
Multiple ChoiceMany young animals are __________, a sexually immature form that is morphologically distinct from the adult stage. These young animals undergo __________ to become __________, which resemble adults but are not yet sexually mature. 632views1rank
Multiple ChoiceIn the embryo of a shark, ectoderm gives rise to __________; mesoderm gives rise to __________; endoderm gives rise to __________. 768views
Multiple ChoiceWhich of the following is the defining characteristic of the clade Ecdysozoa for which this group is named? 697views1rank
Multiple ChoiceOne of the primary developmental/anatomical characteristics distinguishing the major animal phyla is the condition of the body cavity. A pseudocoelomate animal is one in which the body cavity is __________. 651views
Multiple ChoiceThe zygotes of many protostomes undergo __________ cleavage and __________ cleavage. 559views1rank
Multiple ChoiceAn animal with a true coelom that has __________ cleavage must be a(n) __________. 695views1rank
Multiple ChoiceWhich of the following is a trait shared by protostomes and deuterostomes? 721views2rank
Textbook QuestionName two phyla of animals that are radially symmetric and two that are bilaterally symmetric. How do the general lifestyles of radial and bilateral animals differ?740views
Textbook QuestionOne of the characteristics unique to animals is a. gastrulation. b. multicellularity. c. sexual reproduction. d. flagellated sperm.1132views1rank
Textbook QuestionThe table below lists the common names of the nine animal phyla surveyed in this chapter. For each phylum, list the key characteristics and some representatives. 946views
Textbook QuestionWhich synapomorphy (shared, derived trait) distinguishes animals as a monophyletic group, distinct from choanoflagellates? a. multicellularity b. coloniality c. heterotrophy d. movement768views
Textbook QuestionThe distinction between sponges and other animal phyla is based mainly on the absence versus the presence of a. a body cavity. b. a complete digestive tract. c. mesoderm. d. tissues.1054views
Textbook QuestionIdentify the pattern of embryonic development shown in each drawing below and name the phylum (or phyla) that exhibit this pattern. 775views
Textbook QuestionIn a tube-within-a-tube body plan, what is the interior tube derived from? a. ectoderm b. mesoderm c. the coelom d. endoderm620views
Textbook QuestionWhich of the following was probably an important factor in bringing about the Cambrian explosion? (A) the movement of animals onto land (B) an increase in the concentration of atmospheric nitrogen (C) the emergence of predator-prey relationships (D) the origin of bilaterian animals1210views
Textbook QuestionWhich of the following was probably the least important factor in bringing about the Cambrian explosion? a. the emergence of predator-prey relationships b. an increase in the concentration of atmospheric oxygen c. the movement of animals onto land d. the origin of Hox genes897views
Textbook QuestionBilateral symmetry in animals is best correlated with a. an ability to see equally in all directions. b. the presence of a skeleton. c. motility and active predation and escape. d. adaptation to terrestrial environments.1294views
Textbook QuestionTrue or false? New major animal body plans have continued to evolve since the Cambrian about 550 million years ago.451views
Textbook QuestionWhich of the following combinations of phylum and description is correct? (A) Echinodermata—radial symmetry as a larva, coelom (B) Nematoda—roundworms, internal skeleton (C) Platyhelminthes—flatworms, gastrovascular cavity, no body cavity (D) Porifera—gastrovascular cavity, coelom1574views
Textbook QuestionBased on the tree in Figure 32.11, which statement is false? a. The animal kingdom is monophyletic. b. Acoelomate flatworms are more closely related to echinoderms than to annelids. c. Sponges are basal animals. d. Bilaterians form a clade737views
Textbook QuestionSelect True or False for each statement. T/F Sister chromatids are homologous chromosomes. T/F Non-sister chromatids are found on two different homologs. T/F Crossing over occurs between sister chromatids. T/F A chiasma forms between two of the four molecules of double-stranded DNA on duplicated homologous chromosomes.645views
Textbook QuestionWhy is it ecologically significant that animals are heterotrophic and multicellular?430views
Textbook QuestionWhich of the following animal groups does not have tissues derived from mesoderm? a. annelids b. echinoderms c. cnidarians d. flatworms912views
Textbook QuestionIf you followed a woman's cells through meiosis, at what stage of meiosis would the amount of DNA in one of these cells be equal to the amount of DNA in one of her G1 phase (before DNA replication) kidney cells?644views
Textbook QuestionA species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. (a) Design an experimental study to test this hypothesis.558views
Textbook QuestionA species of rotifer, a small freshwater invertebrate, lost the ability to reproduce sexually millions of years ago. A remarkable feature of its life cycle is the ability to withstand dry conditions. When the rotifer's environment dries out, so does the rotifer, and it can be blown to a new area. Rotifers that land in water will rehydrate and resume an active life. A major pathogen of these rotifers is a species of fungus that cannot survive drying. Some scientists hypothesize that drying rids the rotifers of this pathogen. (b) Why might the ability to withstand drying reduce any potential advantage of sexual reproduction in this rotifer species?559views
Open QuestionWhich of these familiar animals are all protostomes?a. clams, shrimp, goldfish, leechesb. butterflies, spiders, snakes, crabsc. earthworms, snails, beetles, squid51views
Textbook QuestionBased on the tree in Figure 32.11, which statement is true?A. The animal kingdom is not monophyletic.B. The Acoela are more closely related to echinoderms than to annelids.C. Sponges are basal animals.D. Bilaterians do not form a clade.77views
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