为了探究温度对蚕卵孵化率是否有影响，某同学做了如下实验。他选取紫黑色的蚕卵(这种颜色的卵是已经受精的卵)若干，分成三组放到多功能培养箱中进行培养，实验结果如下表：                                                                                                                                                                                                                                                              

	甲组	乙组	丙组
蚕卵的数量(个)	100	100	？
温度(℃)	16	25	30
湿度	75%	75%	75%
孵化出蚕蚁所需的时间(天)	10	9	8
孵化率	90%	98%	68%