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A new biography of the talented mahjong girl
Author: Lingshang
Confessions again
Update time 2010-1-17 8: 09: 31word count: 8 156.
1. species: species for short, which is the basic unit of classification. Animals of the same species are similar in morphological structure and physiological function, have a certain natural distribution area, and have the same ancestor. Animals with sexual reproduction can naturally combine male and female individuals to produce reproductive offspring.
2. Radiation symmetry: Through the central axis of the body, only many sections can divide the body into two equal parts.
3. Posterior renal duct: the excretory organ of some invertebrates; The two ends are open and consist of a renal orifice, a renal tubule, a drainage tube and a renal foramen;
4. Cutaneous muscle sac: the body wall formed by the muscle formed by mesoderm and the epidermis formed by ectoderm in flat animals.
5. Verrucous foot: a flat protrusion formed by the protruding body wall of annelids, the most primitive form of appendages. It has the function of paddling and swimming.
6. Oropharyngeal breathing: The breathing action of amphibians depends on the vibration of the bottom of the mouth, and the gas is exchanged by the oral mucosa.
7. Chordata: A rod-shaped structure on the back of chordates, which plays a supporting role. Located on the back of digestive tract and the ventral surface of neural tube, it has an elastic and unsegmented structure.
8. Double breathing: Birds have air sacs that communicate with trachea and lungs, so that birds can exchange gas when exhaling and inhaling.
9. Mammals: vertebrates with whole body fur, fast movement, constant temperature, viviparous and lactation. A group of higher animals with the most complicated body structure, function and behavior among spinal propellers.
10 mixed body cavity: During the embryonic development of arthropods, the pericardial cavity wall representing the secondary body cavity disappears, and the large primary body cavity between the digestive tube and the body wall is mixed with the secondary body cavity, which is called mixed body cavity. Because this mixed body cavity is often filled with blood, it is also called blood cavity.
1 1. Bilateral symmetry: from platypus ...
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