Object A has a mass of 40g and a volume of 30mL. Object B has a mass of 15 g and a volume of 20 mL.

What will happen when both objects are placed in water?

Object A will float because its density is less than water

Object B will sink because its density is greater than water

Object A will sink because its density is greater than water

Objects A and B will both float because their density is the same as water

How can you approximate the number of calories required to keep you in energy balance?

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.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?