What the three basic criteria are used to determine climate zones?

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

Which if the following best describes why invertebrates isn’t considered a scientifically valid word when classifying animals

Explain what is meant by a river’s load, and describe how the load is carried.