But why did they take place?但这些变化为何会发生

take place发生

The fete will take place on Sunday, rain or shine.

游园义卖会定于星期日举行,风雨无阻。

Lengthy negotiations must take place before any agreement can be reached.

要进行多次长时间谈判才能达成协议。

how they got on with each other他们之间相处又是如何改变进化历程的

get on with与 ... 友好相处

Do you get on with your parents?

你和父母合得来吗?

surviving on a diet of raw fruit and vegetables.单靠生鲜蔬果为生

survive on靠 ... 活下来； 靠 ... 生存

These players have to survive on their wiles.

这些运动员得靠诡计才能不被淘汰。

They can survive on very little money.

他们用很少的钱就可以生存。