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Ch. 32 - An Overview of Animal Diversity
Campbell - Campbell Biology 12th Edition
Urry12th EditionCampbell BiologyISBN: 9785794169850Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 12th EditionCh. 32 - An Overview of Animal DiversityProblema 1
Capitolo 32, Problema 1

One of the characteristics unique to animals is
a. Gastrulation
b. Multicellularity
c. Sexual reproduction
d. Flagellated sperm

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1
Understand the question: It asks for a characteristic unique to animals, meaning it should be a feature that is not found in other kingdoms like plants, fungi, or protists.
Review the options: a. gastrulation, b. multicellularity, c. sexual reproduction, d. flagellated sperm.
Consider each option: Multicellularity (b) is found in plants and fungi, sexual reproduction (c) is common in many organisms including plants and fungi, flagellated sperm (d) can be found in some plants and protists.
Focus on gastrulation (a): Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula. This process is unique to animals.
Conclude that gastrulation is the characteristic unique to animals, as it is a developmental process not found in other kingdoms.

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Gastrulation

Gastrulation is a crucial phase in embryonic development where the single-layered blastula reorganizes into a multilayered structure known as the gastrula. This process establishes the primary germ layers: ectoderm, mesoderm, and endoderm, which later differentiate into various tissues and organs. Gastrulation is unique to animals and is essential for proper development.
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Implantation and Gastrulation

Multicellularity

Multicellularity refers to organisms composed of multiple cells that work collaboratively, allowing for specialization and division of labor among different cell types. This characteristic is not exclusive to animals, as plants, fungi, and some protists also exhibit multicellularity. It enables complex structures and functions, such as tissues and organs, to develop.
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Unicellular vs. Multicellular

Flagellated Sperm

Flagellated sperm are sperm cells equipped with a flagellum, a whip-like structure that enables motility, allowing them to swim towards the egg for fertilization. This feature is common in many animal species, facilitating sexual reproduction. While flagellated sperm are prevalent in animals, they are not unique to them, as some plants and algae also produce flagellated gametes.
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Rhizarians and Amoebozoa
Pratica correlata
Domanda del libro di testo

Based 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.

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Domanda del libro di testo

The 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

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Domanda del libro di testo

Which 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 animals

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