DNA has to replicate before a cell divides because each daughter cell has to receive a complete set of genetic information.

which of the following is NOT a problem caused by human population growth?
a. not enough natural recourses to meet needs
b. not enough clean water
c. not enough cleared land
d. not enough carbon dioxide

d. not enough carbon dioxide.
Not enough carbon dioxide isn't a problem with human population growth because we need Oxygen to breath and not carbon dioxide.
Invasive exotic species are species that interfiere with the natural food chain and are usually foreign