Plzz me with this question i m the new on plzz me

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Explain how organisms could be harmed by high levels of salt from roadways?

If your blood becomes too concentrated with iona, what will happen to the red blood cells