The red sizing bead in this image is 10um in diameter. What is the length of a chloroplast? a20um b100um c2um d1um e10um

In general in which direction does wind blow

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.

Individuals do not compete directly for resources, but are prey for the same predator