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Questions and Answers
What is the embryonic origin of epithelial tissue?
What is the embryonic origin of epithelial tissue?
- Mesoderm only
- Mesoderm and endoderm
- Ectoderm only
- Endoderm and ectoderm (correct)
Which of the following is NOT correctly matched with its germ layer tissue?
Which of the following is NOT correctly matched with its germ layer tissue?
- Ectoderm - Skin
- Endoderm - Lining of digestive system
- Ectoderm - Liver (correct)
- Mesoderm - Muscles
What is unique to animals?
What is unique to animals?
- Nuclei
- Chloroplasts
- Ability to move (correct)
- Cell walls
What is the most likely ancestor of all animals?
What is the most likely ancestor of all animals?
What is a characteristic of diploblasts?
What is a characteristic of diploblasts?
Which groups of animals are non-bilaterian?
Which groups of animals are non-bilaterian?
What is NOT a benefit of indirect development in animals?
What is NOT a benefit of indirect development in animals?
How do animals reproduce?
How do animals reproduce?
How are animals classified based on egg and embryo development?
How are animals classified based on egg and embryo development?
What do sponges have that ctenophores lack?
What do sponges have that ctenophores lack?
What is the primary function of the outer layer of epithelial tissue in most animals?
What is the primary function of the outer layer of epithelial tissue in most animals?
Which of the following is a characteristic shared by all animals?
Which of the following is a characteristic shared by all animals?
What is the primary difference between diploblasts and other animals?
What is the primary difference between diploblasts and other animals?
Which of the following groups of animals is characterized by having only two germ layers?
Which of the following groups of animals is characterized by having only two germ layers?
What is the primary advantage of internal fertilization in animals?
What is the primary advantage of internal fertilization in animals?
Which of the following is a characteristic of ovoviviparous animals?
Which of the following is a characteristic of ovoviviparous animals?
What is the outer layer of protective tissue that lines the surface of most animals?
What is the outer layer of protective tissue that lines the surface of most animals?
Which two embryonic tissue layers are present in diploblasts?
Which two embryonic tissue layers are present in diploblasts?
What is the primary characteristic that distinguishes animals from other kingdoms?
What is the primary characteristic that distinguishes animals from other kingdoms?
What is the likely origin of all animals?
What is the likely origin of all animals?
Which of the following groups of animals consists of three distinct groups?
Which of the following groups of animals consists of three distinct groups?
What type of fertilization occurs internally in animals?
What type of fertilization occurs internally in animals?
What is the function of the epithelial tissue in most animals?
What is the function of the epithelial tissue in most animals?
Which of the following is a characteristic of oviparous animals?
Which of the following is a characteristic of oviparous animals?
What is the primary difference between sponges and ctenophores?
What is the primary difference between sponges and ctenophores?
What is the primary benefit of indirect development in animals?
What is the primary benefit of indirect development in animals?
What is the primary function of the epithelial tissue in most animals?
What is the primary function of the epithelial tissue in most animals?
What is the characteristic that distinguishes diploblasts from other animals?
What is the characteristic that distinguishes diploblasts from other animals?
What is the primary difference between oviparous and ovoviviparous animals?
What is the primary difference between oviparous and ovoviviparous animals?
What is a characteristic shared by all non-bilaterian animals?
What is a characteristic shared by all non-bilaterian animals?
What is the likely ancestor of all animals?
What is the likely ancestor of all animals?
What is the primary benefit of indirect development in animals?
What is the primary benefit of indirect development in animals?
What is unique about the embryonic origin of epithelial tissue?
What is unique about the embryonic origin of epithelial tissue?
What is the primary characteristic of oviparous animals?
What is the primary characteristic of oviparous animals?
What is the primary difference between ctenophores and sponges?
What is the primary difference between ctenophores and sponges?
How are animals classified based on egg and embryo development?
How are animals classified based on egg and embryo development?
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Study Notes
Embryonic Origin of Epithelial Tissue
- Epithelial tissue originates from the endoderm and ectoderm.
Characteristics of Animals
- Unique traits: reproduce sexually through internal fertilization, produce large numbers of eggs, and have a larval stage in their life cycle.
Development of Animals
- Animals can be grouped as viviparous, oviparous, or ovoviviparous depending on where eggs and embryos develop following internal fertilization.
- Indirect development is beneficial for producing a large number of eggs, larvae, and reproductive stages.
Origin of Multicellularity
- Sponges-first hypothesis suggests that sponges were the first multicellular animals, supported by the presence of miRNAs in sponges but not in ctenophores.
Ancestry of Animals
- The last common ancestor of all animals was likely a multicellular organism.
Body Structure of Animals
- Diploblasts have two embryonic tissue layers: ectoderm and endoderm.
- Non-bilaterian animals include three groups: sponges, cnidarians, and ctenophores.
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