How heavy is 8.3 billion metric tons? choose all that are correct. 822,000 eiffel towers 25,000 empire state buildings 8 million blue whales 10 billion elephants

What are the types of genetic recombination

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.

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?