A student collected five leaves from around his neighborhood. He made a dichotomous key to help him identify each of the leaves. Which of these could the student include in his dichotomous key to classify the leaves? A.

How many leaves were found on the ground

B.

Whether or not the leaves were dry

C.

Whether or not the leaves had pointed tips

D.

How many leaves of each type were found

Which of the following statements is correct in hour our immune system responds to a potential pathogen? a. the adapted immune system will call on the innate immune system to destroy the pathogen. b. b cells will start reading the antigen code immediately and call t cells to assist in destroying the pathogen. c. the skin will be the first line of defense, and then the many phagocytes in the bloodstream will attempt to consume the possible pathogen. d. the t-cells in the adapted immune systems are the first to recognize the pathogen vaccines are weakened forms of disease causing microorganisms, which are given to patients to prevent disease. after the vaccine is administered, the immune system responds by creating a(n) to recognize the a. antigen, antibody b. antibody, antigen c. antibody, antibiotic d. antibiotic, antibody