CHAPTER 12: MOLLUSCA Mollusca is an enormous taxon 2nd only to Arthropoda in number of living species Includes many familiar animals such as snails‚ clams‚ oysters‚ mussels‚ slugs‚ octopods and squids in seven lining classes Mollusca includes the taxa: Aplacophora consists of small‚ wormlike molluscs w/ numerous calcareous spicules rather than a shell. Polyplacophorans or chitons have eight shell plates Monoplacophorans have a low‚ conical‚ limpetlike shell and live in deep water
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Characteristics of the Phylum Arthropoda The segmented bodies are arranged into regions‚ called tagmata (e.g.‚ head‚ thorax‚ abdomen). The paired appendages (e.g.‚ legs‚ antennae) are jointed. They posses a chitinous exoskeletion that must be shed during growth. They have bilateral symmetry. The nervous system is dorsal (belly) and the circulatory system is open and ventral (back). Arthropod Groups (taxa) The arthropods are divided into two large groups that exist today: The Chelicerates
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| | |Freshwater Stingray (Potamotrygonidae) Conservation through Captive Breeding Programs | | A Research Proposal | |
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Observe a class in an elementary/secondary school in your area. Have a verbatim record of the teacher’s questions. Assess how well each question asked was able to move towards concept development. Analyze mistakes‚ if any‚ on the questioning process. Explain how you would have done the questioning and developed the concept as intended by the teacher. I observed a Science class in the elementary level‚ Grade 6‚ at the University of the Philippines Integrated School (UPIS). Professor REV was teaching
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Title: “ Chalk out of seashell s” Name: Gerald P. Raboy School: Cabittaogan National High School Address: Cabuloan Sta. Catalina Ilocos Sur ABSTRACT The study on the production of chalk out of seashells were designed to produce quality dustless and long lasting chalk to compare with the standard existing commercialized chalks if there are any‚ which was sold in the market. The chalk out of seashells is for local or non-local used for schools or any educational aspects or even at
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ASEXUAL REPRODUCTION Asexual reproduction is a mode of reproduction by which offspring arise from a single parent‚ and inherit the genes of that parent only; it is reproduction which does not involve meiosis‚ ploidy reduction‚ or fertilization. The offspring will be exact genetic copies of the parent. A more stringent definition is agamogenesis which is reproduction without the fusion of gametes. Asexual reproduction is the primary form of reproduction for single-celled organisms such as the archaea
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snails and insects o Such organisms are called uricotelic. Excretory Organs in Animal Kingdom • Protonephridia (flame cells): Excretory structures in platyhelminthes and some cephalochordates like Amphioxus • Nephridia: In earthworms and other annelids • Malpighian tubules:In insects‚ including cockroach • Antennal glands(Green Glands): In crustaceans (prawns) • Vertebrates and some molluscs have kidneys to perform excretion Human Excretory System • Consists of: Kidneys (2)‚ Ureters (2)‚ Urinary
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Abstract: : The purpose of studying the biological organisms in the Mpenjati estuary-beach system is to distinguish between organisms and estimate diversity within the estuary found at different locations along the estuary-beach profile in accordance with factors affecting the daily routines of these marine life and other aspects in which these organisms concur with. The organisms found in these waters play an important role in the ecosystems they function in therefore it is imperative to seek a
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Plant and animal microorganisms drifting in the ocean c. A group of filter-feeding microorganisms d. Oceanic bacteria e. Seaweed 2. Examples of a suspension feeder and a deposit feeder would be‚ respectively‚ a. Clams and fish B. Polychaete annelid and earthworms c. Earthworms and rotifers d. Basking sharks and rotifers e. Earthworms and clams 3. The evolution of an alimentary system is primarily to allow a. Storage of food before digestion b. Intracellular digestion C. Extracellular
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members. The name Lophotrochozoa refers to two different structures observed in animals belonging to this clade. Some animals develop a structure called a lophophore‚ a crown of ciliated tentacles that function in feeding. Other phyla‚ including annelids and molluscs go through a distinctive larval stage called the trochophore
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