Which statement describes one characteristic of index contour lines? O They appear thinner and lighter than other lines on a map.
They show regions where a difference in elevation exists.
O They show the locations of roads and paths on the landscape.
They show ratios used to determine the actual distance on a map.

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.

Cassandra made a venn diagram to compare and contrast the two stages of cellular respiration. which belongs in the area marked x? energy is released. oxygen is used up. glucose is broken down. carbon dioxide is used up.

Involving transcription and translaton. explain the causes and effects of damage to the genetic code.