What needs to be in place for natural selection to happen?

For men, which number and frequency of drinks defines binge drinking

Why is it often difficult to get funding for local parks? a. state governments do not like to grant permits for local parks. b. federal regulations prohibit most fund raising. c. there is often a small tax base. d. federal funding cuts have all but stopped local construction of parks.

Which a hammer strikes a compound formed by covalent bounds