2. Como se explica la acción de las fuerzas universales (gravitatorias, electromagnetecas e internucleares) en cada teoría sobre el origen del universo. teoria innfalcionaria
teoria de universo estacionario
teoria de universo oscilamte o pulsante
tepria del big- bang o de la gran explosion

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 causes darkening of the skin as melanin production increases

Which of the following human activities resulted in the growth of the north american deer population?