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  1. ...goat with a weakened anthrax bacteria. Acontrol group of equal numbers was left without injections. A few weekslater they came again and injected...

    分類:科學及數學 > 生物學 2009年10月29日

  2. ...stringent definition is agamogenesis which refers to reproduction without the fusion of gametes. Asexual reproduction is the primary form...

    分類:科學及數學 > 生物學 2007年04月23日

  3. ... the answer couldn't be calculated here without detailed values provided. ...influx. But I can't say if this condition equals the water potential to be "zero" or not. hope this...

    分類:科學及數學 > 生物學 2009年11月09日

  4. ... draw a series of black and white lines of equal width on a grid (similar to a bar code). Next, place the...would not be able to distinguish more than about 12 lines without the lines blurring together. So a human...

    分類:科學及數學 > 生物學 2007年04月12日