Why do solids maintain thier shape, whereas fluids do not?

Embryos of different species look very similar, which shows that the organisms share a ancestor.

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

The diagram below shows the different phase transitions that occur in matter. which arrow represents the transition in which dew is formed?