Which energy source is the result of tiny sea creatures being compressed

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

What factors contribute to the effect an environmental toxin has on the human body?

What are antigens and antibodies? how are they involved in the body’s response to incompatible blood?