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有一株玉米顶端和叶腋均生长雌花序，还有一株仅顶端有雌花序，为什么？

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在人类群体里，一般色盲的男人多于女人，如果外祖父是色盲，其女儿不是色盲，但外孙可能患色盲，试分析这种现象

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[ A] even if
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The female ostrich would push some of the eggs out of her nest because_________
[A] she can only hatch her own eggs
[B] those eggs are unlikely to be hatched
[C] those eggs are to be hatched by others
[D] she can only hatch a limited number of eggs