Two common species of frogs from the genus bombina (b. bombina and b. variegata) live in similar latitudes and ecological conditions, but in two different regions, central and eastern europe. in a narrow strip between these regions, scientists observed a third species, which might have been a hybrid between the former diverging populations of the ancestral species. what evolutionary process might be responsible for the speciation in bombina? top of form
a. allopatric speciation
b. parapatric speciation
c. sympatric speciation
d. none of the above
e. bottom of form

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