Knowing only its location and geological history, you would expect the Olympic Peninsula to harbor a unique collection of organisms because A. its isolation from the rest of the continent during the last 20,000 years would cause the organisms living there to accumulate unique alleles and traits not shared with their close relatives. B. it is surrounded on three sides by water, continuing the physical isolation that causes unique traits to accumulate. C. the Olympic Mountains create a massive cooling effect, which in turn leads to unique selection pressures on the peninsula's organisms. D. A and B E. A, B, and C

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.

1. which of the following transport mechanisms utilizes energy? a. osmosis b. diffusion c. facilitated diffusion d. endocytosis

Read the article and use the information to answer the questions that follow discovering the structure of dna explain how the discoveries by rosalind franklin watson and crick build an accurate model of dna done