The crab is a natural predator to the snail. overtime, the shell of the snail has become thicker and spinous to deter the crab’s predation. the evolutionary response to this would most likely be that the crab species will become extinct because they have no food source. the snails will thrive and the predator/prey relationship will swing back. the crab will find a new organism to prey upon. the crab will evolve to have more powerful claws.

the crab will evolve to have more powerful claws.

Explanation: Evolution is the change in the characteristics and features of a species over generation which develops due to natural selection and adaptation within the course of time. The predator is an organism which kills other organism to obtain it as food. The prey is an organism which is killed by the other organism.

According to the given situation, if the prey develops special adaptations to prevent itself from the predator. The predator will also be evolved so as to obtain prey as food. Therefore, the crab will evolve to have more powerful claws is the correct option.  

the answer is c. it will give up it's valence electron to the other atom.

imagine a line passing through the center of earth that goes through both the north pole and the south pole. this imaginary line is called an axis. earth spins around its axis, just as a top spins around its spindle. this spinning movement is called earth's rotation. at the same time that the earth spins on its axis, it also orbits, or revolves around the sun. this movement is called revolution.