珊瑚是生物．______．
珊瑚不是生物，是珊瑚虫分泌的外壳堆积在一起慢慢形成的．珊瑚虫才是生物．因此珊瑚是生物的说法是错误的．
故答案：×
By age 7 months, an infant most likely will develop which of the following motor skill
A．Walk with one hand held.
B．Eat successfully with a spoon.
C．Stand while holding onto furniture.
D．Sit alone using the hands for support.
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