The presence of a hitchhiker's thumb is a inherited trait. Having the trait is represented through shading. How many individuals in the family have a hitch hitchhiker's thumb? *

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

This aquarium exhibits biotic and abiotic factors in an aquatic environment. one of the abiotic factors is

How does the nervous system affect the excretory system?