What occurs when the bronchioles end in tiny air sacs called alveoli? will TRY to mark brainliest correct answer only!!

Charlie is easily winded during soccer practice and wants to improve his cardiorespiratory fitness. which activity would be best for him to choose? lifting weights walking from one class to another running in a 5k race riding a bike at a leisurely pace

Which stage of stress includes the “fight-or-flight” response? automatic exhaustion alarm resistance

Complete each statement about nutrition. a good strategy for meeting the nutrient needs of an infant is to . vitamin d during childhood is an important nutrient to .