Sequence of events occurring in DNA replication

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

Which fossil organism in whale evolution do you think was the first to live mostly in water? explain your claim with evidence and reasoning?

Glands that the body deal with stress and respond to emergencies.