three structure of crayfish that are adaptation for the life in the water?

Answer 1

Gills for getting oxygen from water.
Tail (telson) for quick getaways - jets away with a single flip.
Swimmerets for carrying around the eggs underwater. The eggs still stay moist, but are protected under the female's abdomen and are "waved" around in the water to have enough oxygen.

Answer 2

1. Have a hard time accepting compliments (still working on that) 2. I don't tell friends when I am angry with them 3. I secretly get jealous sometimes