Aflea is able to pierce skin because its mouthparts come together to form a needlelike drinking tube. based on this adaptation, what is a niche of a flea in a forest ecosystem?

a.
it is preyed upon by deer.

b.
it feeds on the blood of black bears.

c.
it is capable of surviving up to a year without food.

d.
it prevents infection from disease-causing organisms.

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