What causes the ocean's surface water to be warmer than water in the mixed zone or deep zone? a. salty water is denser than freshwater. b. icebergs melt near the ocean floor. c. the sun's rays hit the surface directly. d. upwelling pushes warm water to the surface.

Which of the following statements are true chromosomes make up genes

Which is an advantage of having memory cells when a pathogen is encountered for a second time. a) the memory cells are what proliferate into clones of cells in response to the binding of an antigen. b) memory cells are vital to the primary immune response in that they immediately recognize pathogens even at the first encounter. c) memory cells are essentially effector cells that are short lived and attack antigens even without having a receptor specific to that antigen. d) it ensures that more lymphocytes with a receptor specific to a particular antigen will be present than in a host that had never encountered that pathogen.

An example of a trait that would be considered acquired and inherited is a. a cleft chin b. muscle tone c. scar tissue d. freckled skin