10 Dylan is listing the substances that make up DNA. Which of these substances should he list as a nucleotide base found in DNA?
A adenine
C sugar
B phosphate
Duracil

Acid rain is the direct result of acid released by burning fossil fuels. select the best answer from the choices provided ot o f true or false

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

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.