1. The word approach means to "come closer to" or "come toward". That sentence just means you can get anywhere in the building by using one entrance. You can go through the entrance and then go toward whatever other area in the building you want. 2. "Uninterrupted space" means.... like an empty room. Think about an empty room. You are on one side and the door is on the other. If the room is empty other than you and the door then all the space in between is uninterrupted. You can get to the door in one straight line with nothing slowing you down. And if someone moves a table or something in between you and the door then the space becomes interrupted. You have to move around the table first to get to the door.

1. "How else could" is in reference to the confidence ants have and how they know what needs to be done. Without the confidence and knowledge of what needs to be done they could not do the things listed (organize highways, build elaborate nests etc.) In other words..... without confidence and knowledge what other way would they have to get things done?? 2. Highways is probably metaphorical. Ants march in organized rows similar to how cars drive in lanes on a highway. 3. Not sure about this one. To "stage an epic raid" just means to plan and carry out an attack with the goal of stealing food or houses or other resources from others. I have never known ants to be that aggressive but maybe they are. 4. In this context "after all" is kind of hard to explain. I guess it is just a short way of saying "In spite of how intelligent they appear everything they accomplish is a group effort. They could never do this on their own". Sort of summarizing the sentence.

Lend or give would be best. Provide is ok. Contrary to the apparent popular opinion "render" actually would work here. It just sounds unusual. I have heard the phrase "render support" or "render aid" in reference to sending someone somewhere to help out but it isn't typically used by anyone too often.