1. You may have walked along a beach and collected seashells. The shells were once part of animals called mollusks. A mollusk is an invertebrate with a mantle, a large foot, and usually a shell. Most mollusks live in the ocean. Some live in freshwater or moist soil. Snails, clams, squid, and slugs are all mollusks.
2. Mollusks share characteristics. many All have bilateral symmetry. All have body cavities, or coeloms, and digestive tracts with two openings. Most have a muscular foot that helps them move. Most have heads, and some have tentacles. All mollusks have nervous systems with brains.
3. All mollusks have soft bodies. Many have hard shells or shell-like coverings. All mollusks have mantles, which are layers of tissue that surround the inside organs. In animals with a shell, the mantle produces the shell. The mantle protects the body in mollusks without a shell. Most mollusks have gills. Gills are organs that exchange carbon dioxide for oxygen in water. Snails and slugs that live on land do not have gills. They have a lung-like organ.
4. Mollusks are grouped into three classes Gastropods include snails, slugs, limpets, and conches. Gastro means "stomach." Pod means "foot." A gastropod's foot is located under its body. All gastropods except slugs have a single shell. When danger threatens, these mollusks can pull completely into their shell. Gastropods have tiny teeth that rip up the plants or animals they eat. Some scrape algae off rocks for food.
5. Gastropods have blood transportation systems in which blood moves through vessels and then out into open spaces around the body organs. This is called an open circulatory system. After blood is pumped by the heart, it leaves the vessels. It sloshes around body organs and then moves to the gills. There, oxygen and carbon dioxide are exchanged. Then the blood moves back to the heart.
6. The second class of mollusks is bivalves. These include clams, oysters, mussels, and scallops. Bi means "two." Each of these animals has a two-part shell that works like a hinge. They use powerful muscles to pull their shells closed.
7. Bivalves are well-suited to live in water. Most do not move around much. Clams burrow under sand with their feet. Mussels and oysters attach to a solid surface to prevent waves from washing them away. Scallops move by rapidly opening and closing their shells. As water is forced out, the animals move in the opposite direction.
8. Like gastropods, bivalves have open circulatory systems. Unlike gastropods, they have no definite heads. They do not have teeth. Instead, they filter food particles from water.
9. The third class of mollusks is cephalopods. It includes the squid and nautiluses. The octopus on the front of this card is also a cephalopod. Cephalo means "head." Cephalopods have tentacles around their heads instead of feet. The tentacles help them swim, walk, and capture prey. They all live in the ocean. They move by forcing water out of a siphon in one direction. This causes them to move in the opposite direction. The giant squid is the world's largest invertebrate. It can grow to a length of 18 meters and a weight of 900 kilograms. That's longer than a school bus and probably weighs more than your whole class put together.
10. Cephalopods are the most complex of the mollusks. They have highly developed brains and can learn difficult tasks. The octopus is the most intelligent of the invertebrates. Cephalopods have teeth. Some produce poisons. Unlike the other groups of mollusks, they have closed circulatory systems. Their blood does not leave the blood vessels.
1. You may have walked along a beach and collected seashells. The shells were once part of animals called mollusks. A mollusk is an invertebrate with a mantle, a large foot, and usually a shell. Most mollusks live in the ocean. Some live in freshwater or moist soil. Snails, clams, squid, and slugs are all mollusks. 2. Mollusks share characteristics. many All have bilateral symmetry. All have body cavities, or coeloms, and digestive tracts with two openings. Most have a muscular foot that helps them move. Most have heads, and some have tentacles. All mollusks have nervous systems with brains. 3. All mollusks have soft bodies. Many have hard shells or shell-like coverings. All mollusks have mantles, which are layers of tissue that surround the inside organs. In animals with a shell, the mantle produces the shell. The mantle protects the body in mollusks without a shell. Most mollusks have gills. Gills are organs that exchange carbon dioxide for oxygen in water. Snails and slugs that live on land do not have gills. They have a lung-like organ. 4. Mollusks are grouped into three classes Gastropods include snails, slugs, limpets, and conches. Gastro means "stomach." Pod means "foot." A gastropod's foot is located under its body. All gastropods except slugs have a single shell. When danger threatens, these mollusks can pull completely into their shell. Gastropods have tiny teeth that rip up the plants or animals they eat. Some scrape algae off rocks for food. 5. gastropods มีระบบการขนส่งเลือดในที่เลือดย้ายเรือและแล้วเข้าเปิดช่องว่างรอบ ๆ อวัยวะร่างกาย นี้เรียกว่าระบบไหลเวียนโลหิตเปิด หลังจากที่เลือดถูกสูบ ด้วยใจ ใบเรือ มัน sloshes รอบ ๆ อวัยวะ และจากนั้น ย้ายไป gills มี ออกซิเจนและก๊าซคาร์บอนไดออกไซด์มีการแลกเปลี่ยน จากนั้น เลือดย้ายกลับไปพัก 6. ชั้นสองของ mollusks bivalves ได้ ได้แก่หอย หอยนางรม ภู่ และหอย Bi หมายความว่า "2" ของสัตว์เหล่านี้มีเปลือกสองส่วนที่ทำงานเหมือนกับบานพับ พวกเขาใช้กล้ามเนื้อมีประสิทธิภาพเพื่อดึงของเชลล์ปิด 7. bivalves เหมาะพักอาศัยอยู่ในน้ำได้ ส่วนใหญ่ไม่เคลื่อนย้ายไปรอบ ๆ มาก หอยเจาะรูไปทั่วใต้ทรายกับเท้าของพวกเขา ภู่และหอยนางรมกับพื้นผิวของแข็งเพื่อป้องกันไม่ให้คลื่นชะนั้น หอยย้ายอย่างรวดเร็วเปิด และปิดของเชลล์ ขณะที่น้ำถูกบังคับออก สัตว์ย้ายในทิศทางตรงกันข้าม 8. เช่น gastropods, bivalves ได้เปิดระบบไหลเวียนโลหิต ต่างจาก gastropods มีหัวไม่มีแน่นอน พวกเขาไม่มีฟัน แทน พวกเขากรองอนุภาคอาหารจากน้ำ 9. สามชั้น mollusks cephalopods ได้ มีปลาหมึกและ nautiluses ปลาหมึกด้านหน้าของบัตรนี้ก็เป็น cephalopod Cephalo หมายถึง "หัว" Cephalopods มี tentacles รอบศีรษะของพวกเขาแทนเท้า Tentacles ช่วยให้พวกเขาว่ายน้ำ เดิน และจับเหยื่อ พวกเขาทั้งหมดอาศัยอยู่ในมหาสมุทร พวกเขาย้าย โดยการบังคับให้น้ำจากกาลักน้ำในทิศทางหนึ่ง นี้ทำให้พวกเขาจะย้ายในทิศทางตรงกันข้าม ปลาหมึกยักษ์เป็นกระดูกสันหลังที่ใหญ่ที่สุดในโลก มันสามารถเติบโตมีความยาว 18 เมตรและมีน้ำหนัก 900 กิโลกรัม ที่มีความยาวมากกว่ารถบัสโรงเรียน และคงน้ำหนักขึ้นกว่าของชั้นเรียนทั้งหมดที่ใส่กัน 10. cephalopods สุดซับซ้อนของ mollusks ได้ พวกเขาได้พัฒนาสมองสูง และสามารถเรียนรู้งานยาก ปลาหมึกอัจฉริยะที่สุดของ invertebrates ได้ Cephalopods มีฟัน บางผลิต poisons ซึ่งแตกต่างจากกลุ่มอื่น mollusks พวกเขาได้ปิดระบบไหลเวียนโลหิต เลือดออกจากหลอดเลือด
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1. You may have walked along a beach and collected seashells. The shells were once part of animals called mollusks. A mollusk is an invertebrate with a mantle, a large foot, and usually a shell. Most mollusks live in the ocean. Some live in freshwater or moist soil. Snails, clams, squid, and slugs are all mollusks.
2. Mollusks share characteristics. many All have bilateral symmetry. All have body cavities, or coeloms, and digestive tracts with two openings. Most have a muscular foot that helps them move. Most have heads, and some have tentacles. All mollusks have nervous systems with brains.
3. All mollusks have soft bodies. Many have hard shells or shell-like coverings. All mollusks have mantles, which are layers of tissue that surround the inside organs. In animals with a shell, the mantle produces the shell. The mantle protects the body in mollusks without a shell. Most mollusks have gills. Gills are organs that exchange carbon dioxide for oxygen in water. Snails and slugs that live on land do not have gills. They have a lung-like organ.
4. Mollusks are grouped into three classes Gastropods include snails, slugs, limpets, and conches. Gastro means "stomach." Pod means "foot." A gastropod's foot is located under its body. All gastropods except slugs have a single shell. When danger threatens, these mollusks can pull completely into their shell. Gastropods have tiny teeth that rip up the plants or animals they eat. Some scrape algae off rocks for food.
5. Gastropods have blood transportation systems in which blood moves through vessels and then out into open spaces around the body organs. This is called an open circulatory system. After blood is pumped by the heart, it leaves the vessels. It sloshes around body organs and then moves to the gills. There, oxygen and carbon dioxide are exchanged. Then the blood moves back to the heart.
6. The second class of mollusks is bivalves. These include clams, oysters, mussels, and scallops. Bi means "two." Each of these animals has a two-part shell that works like a hinge. They use powerful muscles to pull their shells closed.
7. Bivalves are well-suited to live in water. Most do not move around much. Clams burrow under sand with their feet. Mussels and oysters attach to a solid surface to prevent waves from washing them away. Scallops move by rapidly opening and closing their shells. As water is forced out, the animals move in the opposite direction.
8. Like gastropods, bivalves have open circulatory systems. Unlike gastropods, they have no definite heads. They do not have teeth. Instead, they filter food particles from water.
9. The third class of mollusks is cephalopods. It includes the squid and nautiluses. The octopus on the front of this card is also a cephalopod. Cephalo means "head." Cephalopods have tentacles around their heads instead of feet. The tentacles help them swim, walk, and capture prey. They all live in the ocean. They move by forcing water out of a siphon in one direction. This causes them to move in the opposite direction. The giant squid is the world's largest invertebrate. It can grow to a length of 18 meters and a weight of 900 kilograms. That's longer than a school bus and probably weighs more than your whole class put together.
10. Cephalopods are the most complex of the mollusks. They have highly developed brains and can learn difficult tasks. The octopus is the most intelligent of the invertebrates. Cephalopods have teeth. Some produce poisons. Unlike the other groups of mollusks, they have closed circulatory systems. Their blood does not leave the blood vessels.
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