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Developmental biology

campbell biology chapter 8 and 12

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Biology
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Human sexuality
Reproduction
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Fertility
Developmental biology
Asexual reproduction
Sexuality
Sex
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Plant reproduction
Parthenogenesis

Exam Name___________________________________ MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) The creation of genetically identical offspring by a single parent, without the participation of sperm and egg, is called 1) A) regeneration. B) sexual reproduction. C) spontaneous generation. D) asexual reproduction. 2) Which of the following statements regarding sexual and asexual reproduction is true? 2) A) Only offspring from asexual reproduction inherit traits from two parents. B) Sexual reproduction is more likely to increase genetic variation than is asexual reproduction. C) Sexual reproduction typically includes the development of unfertilized eggs. D) Cell division only occurs after sexual reproduction.

Classification of Animals and other Kingdoms

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Biology
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Developmental biology
Protostome
Body cavity
Blastopore
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invertebrates
Kingdoms
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Order
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Species

Protostomes Coelomates Mouth develops from the blastopore Cleavage is radial and determinate ALL HAVE A TRUE COELOM! Subkingdom Eumetazoa Bilateral symmetry Coelomates Phylum Mollusca Soft bodied, with hard shell protection Ex: slugs, clams, snails, squids, and octopuses Open circulatory system ? fluid not always contained within vessels but circulates through hemocoel Most have exoskeletons Reduced or no segmentation Radula; rasping tongue to scrape food Many internal organs ? excretion through Three body parts Muscular foot - movement Visceral mass ? contains most of the organs Mantle ? secretes a shell An open circulatory system limits the size of these animals The closed circulatory system is much more efficient! Four classes of Phylum Mollusca

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