Dallas, Texas had an outbreak of West Nile virus, a virus spread by mosquitos, in 2012. In 2012, the mosquito population increased dramatically. What are the limiting factors for these mosquitos? What changed in Dallas between 2011 and 2012?

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.

How many types of rock can form from the rock cycle

In which layer do organisms on earth love?