Acrostic cell theory poem

What occupation did muhammad have before the first revelation

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

In which of the following relationships is one organism always benefited while the other organism is always harmed