What is a vaccination? It's not A a) an injection of a chemical formula that forms a shield around bacteria
b) an injection of a full-strength form of bacteria that causes a disease
c) an injection of weakened bacteria that creates immunity to a disease
d) an injection of blood taken from another person who has no bacteria

How is the male reproductive system different from other body systems? it isn’t necessary to vital signs. it monitors other body systems, and adjusts if necessary. it transports items from one system to another. it is the only system that produces hormones in the male.

Imagine that certain laws of physics could be ignored and you were able to travel vast distances in moments. now imagine that you traveled to an earth-like planet located light-years away that is known to support life. think about what you’ve learned in this unit and make an argument for what you think would be the dominant type of life form on this planet. consider whether a notochord is required for an organism to manipulate its environment and become a dominant creature.

Diagram of the evolution of land plants?