Answer:
D.) All people can mate with one another and have children
Explanation:
In physics, spacetime is any mathematical model which fuses the three dimensions of space and the one dimension of time into a single four-dimensional manifold. Spacetime diagrams can be used to visualize relativistic effects, such as why different observers perceive where and when events occur differently.
less mass is more mass but less energy in more mass. less mass has more energy