17. After a severe drought struck Daphne Major, many of the plants that produced seeds were destroyed. Once
the finches ate all of the small seeds that were left from before, only big tough seeds were left. What do you
think happened to the population of finches on Daphne Major? Use the idea of natural selection to explain
your answer.

Construct at least two possible hypotheses for the student’s experiment.

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

What is the difference between topsoil and clay?