zoo hypothesis

例句：

1. 1. The zoohypothesis suggests that all animals evolved from acommon ancestor.
   动物园假设认为所有动物都起源于共同的祖先。
2. 2. Thishypothesis has been tested in various experiments,but it still needs further research.
   这个假设已经在各种实验中进行了测试，但仍需进一步研究。
3. 3. The theory of evolution bynatural selection is a popular zoo hypothesisamong scientists.
   自然选择进化论是科学家中广为接受的动物园假设。