A student drew a representation of the atoms of a solid. The illustration shows closely packed atoms vibrating, but remaining in the same relative positions.
Which of the following changes must the student make to the illustration to accurately represent the same substance in the liquid phase?

A
The illustration should show increase movement of the atoms.
B
Each individual atom should be much larger.
C
There should be very wide spaces between the atoms.
D
The shape of each atom must reflect the shape of the container.

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.

Explain why ecosystem diversity results in species diversity in a healthy biosphere

In general, characteristics that an organism survive and reproduce become more common in a population over time. what mechanism of evolution cause this change?