I don't understand this question may you answer it and explain

What two temperature scales do scientists use

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 organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants