Assuming that other factors are equal how are the birthrate and death rate related in a stable population

If they were different not only will we be overpopulated but everyone would be going crazy. Sorry, just trying to put it as simple as possible.

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

the dark variety, as they are not visible on the dark tree barks

explanation: