How does the GR protein affect how a rat will behave after a stressful event?

Individuals do not compete directly for resources, but are prey for the same predator

Amale bird-of-paradise uses a dance to attract mates in which it flaps its tail feathers on the ground and jumps around a potential female mate. a different male bird-of-paradise does a similar dance but it jumps around the female in the opposite direction. the female bird is only attracted to one style of dance, in one direction.

Explain how paleontologists use trilobite fossils as index fossils for various geologic time periods.