①酶和核酸都是含有氮元素的生物大分子，脱氧核糖核酸控制酶的合成

②高等植物细胞间不能进行信息交流，因其表面是细胞壁，没有糖蛋白

③抗体、受体、酶、tRNA都具有专一识别的特点

④某化学药物能抑制癌细胞的增殖，它的副作用是白细胞数目增多

⑤基因型为AaBb的体细胞，在有丝分裂的后期，其中一种方式是AB走向一极，ab走向另一极

⑥给正常小鼠饲喂添加了促甲状腺激素的饲料后，小鼠的代谢水平会上升．

①能提供呼吸的单质____；②酸：____；③不含金属元素的盐：____．

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已知椭圆Γ：$\frac{x^2}{a^2}$+$\frac{y^2}{b^2}$=1（a＞b＞0），过原点的两条直线l₁和l₂分别与C交于点A、B和C、D，得到平行四边形ACBD．

（1）若a=4，b=3，且ACBD为正方形时，求该正方形的面积S；

（2）若直线l₁的方程为bx﹣ay=0，l₁和l₂关于y轴对称，Γ上任意一点P到l₁和l₂的距离分别为d₁和d₂，证明：d₁²+d₂²=$\frac{2a^2{b}^2}{a^2+b^2}$；

（3）当ACBD为菱形，且圆x²+y²=1内切于菱形ACBD时，求a，b满足的关系式．

张老汉有一个不争气的儿子，整天好吃懒做，参与赌博，还经常对不能满足其经济要求的父母非打即骂。有一天，儿子又去抢张老汉仅有的一点粮食，张老汉实在忍无可忍，抄起铁锨打向儿子，结果导致其儿子当场死亡。张老汉的行为属于(      )