When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n) . A. The chemical symbol is always a single letter.
B. The chemical symbol always starts with the same letter as the name of the element.
C. The chemical symbol always begins with a capital letter.
D. The chemical symbol can be shared by more than one element.

Ineed to get this test done which of the following statements is correct in hour our immune system responds to a potential pathogen? a.) the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. b.) b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c.) the adapted immune system will call on the innate immune system to destroy the pathogen. d.) the t-cells in the adapted immune systems are the first to recognize the pathogen