At what condition a new queen bee is produced in a hive​

Which of the following examples can cause gene flow between populations? a.an increase in predators to a population of zebra b.a volcanic eruption that kills half of a population of mice c.bird droppings that contain seeds from a different location d.a person that sprays a toxin on a group of mosquitoes

In a cladogram' when does a group of organisms branch off

What are the seven economic and social goals?