Is a normal force a contact force or a noncontact force? What is the normal force on a single book on a shelf?

Which of these organisms have the greatest amount of cell specialized

Each pair of clay balls represents two planetesimals. if each planetesimal is composed of the same material and is separated he the same distance, which pair experiences the frayed gravitational attraction?

Casts and mold are a type of preservation where the original material decays, leaving a mold in surrounding rock that can be filled with another sediment a. true b. false