PEARSON EDEXCEL AS LEVEL JUNE 2023 BIOLOGY B QUESTION PAPER 2//Biology B QUESTIONS AND ANSWERS

PEARSON EDEXCEL AS LEVEL JUNE 2023 BIOLOGY B QUESTION PAPER 2//Biology B QUESTIONS AND ANSWERS Adaptations result from interactions between organisms and their ______. - CORRECT ANSW-environment Natural selection is based on Darwin's observation that individuals most likely to survive and reproduce are those ________. - CORRECT ANSW-with traits best suited to their current environment Which statement is not true of cilia in the respiratory tract? - CORRECT ANSWthey close the windpipe opening when swallowing At the tip of each bronchiole is ________. - CORRECT ANSW-alveoli Which disease causes mucus to build up in the lungs and clog the airways? - CORRECT ANSW-cystic fibrosis Which structure prevents food and liquids from being inhaled when a person swallows? - CORRECT ANSW-the epiglottis During inhalation, air moves directly from the larynx to the _________. - CORRECT ANSW-trachea Which occurs during inhalation? - CORRECT ANSW-the rib cage expands Where is the diaphragm located? - CORRECT ANSW-below the lungs Which action removes carbon dioxide from the body? - CORRECT ANSWexhaling Which structures bring oxygen from the trachea to the lungs? - CORRECT ANSW-bronchi Which event signals the brain to breathe? - CORRECT ANSW-increased blood levels of carbon dioxide The history of life