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  1. ...right side of the heart. Hereditary heart disease, heart disease caused by unavoidable genetic factors since birth . Hypertensive heart disease, heart disease caused by high blood pressure...

    分類:科學及數學 > 生物學 2007年06月07日

  2. ...combination in the hybrid allows for embryonic development to birth . A hybrid has a number of ... are interspecific hybrids bred by mating together two species from within the same...

    分類:科學及數學 > 生物學 2007年07月02日

  3. ...out with fine white fur and will get the correct colored fur within a month of birth . Giant panda cubs are eating bamboo by the time they are 5 to 6 months old and are fully weaned...

    分類:科學及數學 > 生物學 2007年04月04日

  4. ...to 650 lb). They typically measure 1.9 to 2.1 m (6.25 to 7 ft). At birth , cubs weigh 600 to 700 g. A 2004 National Geographic...

    分類:科學及數學 > 生物學 2007年01月16日

  5. ...and is hairless, blind, and earless. At birth the joey, only a quarter of an inch long, crawls into the...on the mother's belly (which is closed by a drawstring-like muscle that the mother can tighten at will) and...

    分類:科學及數學 > 生物學 2007年10月12日