Question 9 of 20 : Select the best answer for the question.
9. What is true of increased levels of co, in the atmosphere?
O A. It always helps plants grow.
O B. It helps some plants grow better, while others experience less growth.
O C. It reduces the amount of climate change.
O D. It's poisonous to plants.
O Mark for review (Will be highlighted on the review page)
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What best describes emerging scientific ideas

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

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