Organic material in soil contains a substance called "humus". Humus is defined as A. dark organic matter that forms from sand
B. dark organic matter that forms from granite
C. dark organic matter that forms when plants and animals decay

In a cladogram' when does a group of organisms branch off

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.

What processes would you expect to be key in the production of yogurt ?