The second question: adopt a dialectical method.
The third question: 1. The law of minimum surface area, that is, nature always tries to determine a space with the smallest surface area. The smaller the surface area, the less heat is lost, and the spherical shape is also the shape with the smallest surface pressure. Nature always tries to create and maintain a state of minimum energy or pressure.
The fourth question: actually, it is very simple. Small soap bubbles have large surface curvature and high pressure, so the internal pressure is also high. After the connection, the air naturally flows from the small soap bubbles with high pressure to the large soap bubbles with relatively low pressure.
The fifth question: for example, the effective use and robustness of the hive space; Defensiveness and warmth of the magpie nest (there is a barbed ball outside, and there is a small nest inside to keep the chicks warm, and the cold air outside can't get in, which is very ventilated); A circular container has a larger capacity than other containers, and so on.