He didn't do his best, so I didn't ____ ____ ____ him.
俗话说:人有人言,兽有兽语.动物之间如何交流信息呢?如图反映了一只蚂蚁发现食物后,迅速返回巢穴告诉其他同伴,然后大群蚂蚁奔向食物所在地的过程.请仔细观察后回答下列问题:
— It is said humans can live to 200 years.
细胞分裂时,遗传物质的变化是( )