The visceral mass of gastropods take a 180 degree turn during development. This causes the anus to be positioned anteriorly. This process is called
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The visceral mass of gastropods take a 180 degree turn during development. This causes the anus to be positioned anteriorly. This process is called (parthenogenesis/ eutely/ metamorphosis/ torsion)?
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- Describe the movement of cells during early development that change an embryo from a blastula to a gastrula. Name the three main germ layers, describe their relative locations, and list the fates of the cells descended from each layer. What is the name and significance of the opening in the gastrula?Which of the following occurs to the blastocoel during Xenopus development? is replaced by the expanding archenteron becomes the archenteron gives rise to the mesoderm gives rise to the endodermIn protostomes and deuterostomes, the space between the endoderm and the ectoderm is important because:
- Asexual reproduction does exist with numerous unique adaptations, but it is normally sexual with both male and female sexes. a) Describe the different types of parthenogenesis and give an example of each type of insect. b) List and briefly describe four important elements that affect a female's ability to generate eggs and the amount of eggs that are oviposited.Reproduction is usually sexual with both male and female sexes, however asexual reproduction does exist with several unique adaptations. a) Discuss comprehensively the types of parthenogenesis and give an example of insect of each type.In terrestrial arthropods, fertilization is always internal (True/False)?
- Describe the Gastrulation in Caenorhabditis elegans.From a 24-hour chick embryo, provide the answers in the following: Pairs of somites in a 24-hour chick embryo Germ layer/s that forms the head process What begins the formation head of process Germ layer/s that form the proamnion Explain why the notochord is not visible in areas where the somites are seenDraw an egg in its blastula stage and label the parts. What are its distinguishing charcteristics (the blastula) from other embryological stages?
- Study the sea star development slides, including early and late stages and identify the following stages and structures: zygote, two cell stage, morula (stage), blastula (stage), blastocoel (cavity), archenteron (cavity), ectoderm (layer), endoderm (layer), gastrula (stage). **See Table 52.1, Section 52.3 & 52.4 in textbook ** Why is it useful to study the development of sea stars (Echinodermata) when studying human development? What do the two have in common?Internal Anatomy of Female Grasshopper Describe the function of the grasshopper (internal). What are the similarities of the internal anatomy of the grasshopper to SPIDERS AND WORMS? What is the nature of the coelom and the circulatory system of the grasshopper?Describe external fertilization process of sea urchin egg with diagram