A substance with a pH of 6 is called O a base. O neither an acid nor a base. O an acid. O both an acid and a base.

What do heterotrophic cells need to survive?

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

Long term exposure to waves can cause sunburns and skin cancer.