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象的演化

象的演化

lower jaw were the prototype for the highly-specialized skulls of later Proboscidean . The wear pa.....more

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哺乳動物牙齒的基本構造

哺乳動物牙齒的基本構造

using the dental formula. A typical set of mammalian teeth should consist of 3 upper and lower.....more

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脊椎動物化石 哺乳動物 概論

脊椎動物化石 哺乳動物 概論

of the Mesozoic Era. Their cheek teeth are tribosphenic, meaning the upper and lower premolars and molars all.....more

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象齒生長與發育

象齒生長與發育

teeth are lined up inside the mandible and each grow up (lower cheek teeth) or down (upper cheek teeth.....more

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中文名:鏟齒象

or extinct have a pair of upper incisors pointing upward and the lower incisor became less prominent.....more

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中文名:嵌齒象

椎長鼻目嵌齒象Most of the elephants only have a pair of incisors (upper or lower) and only Gomphotherium sp.....more

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中文名:變質帶

部或深變質帶(lower or katazone)，其主要特徵為高溫與高壓之環境，但不涉及變形作用(deformation)。 有關於變質帶之分布範圍、溫度界線與主要特徵詳如表1。 為了能夠有效的涵蓋.....more

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中文名:綠片岩相

成兩個亞相，分別代表低和高的綠片岩相。圖1表示低度綠片岩相(lower greenschist facies)之一般礦物組合。高度綠片岩相以黑雲母的出現為指標，此時白雲母和任何黑硬綠泥石類已消失不復存.....more

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中文名:黃銅礦

, but chalocoprite is more yellowish and lower in hardness. The black-green streak can be used.....more

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中文名:辰砂

specific gravity, and lower hardness. When exposed to the air and weathering, cinnabar decomposes.....more

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中文名:磁黃鐵礦

the lower magnetism) and partly due to the distribution of empty iron unit cells (the more regular.....more

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中文名:古菱齒象

was ground to the diamond shape. The last teeth in the back of upper and lower jaws had the thickness.....more

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中文名:短肢領航鯨

structures. Generally speaking, the upper and lower jaws of these whales have 7 to 9 pairs of teeth.....more

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中文名:真猛?象

primigenius had bulged forehead and short lower jaw. Mammuthus primigenius had dense and enamel plates.....more

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中文名:劍齒象

ice river. Lower sea level worldwide helped the formation of land path and thus, Stegodon sp. was able.....more

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