Which of the following processes will increase the variation between two populations?
earthquakes
mutation
migration
balancing selection
inbreeding

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.

true is the

the tricuspid valve is present between right atrium and right ventricle

geologic time scale (for gradpoint) =)