Survival of at least a few members of a population after a major environmental change is most dependent on
1) the population having an individual that is adapted to the original environment 2) the population having an individual that is adapted to great changes in the temperature and its environment
3) variations in many different traits in many individuals in the population
4) no variations in the color of the fur, skin, or feathers of the individuals in the population

Several billion years ago which gas was the least prevailant in the atmosphere

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b. a light particle

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