Tom grew three inches in one year. Which organ system was directly responsible for his growth spurt? A. Respiratory system
B. Digestive system
C. Circulatory system
D. Endocrine system,

Always use significant figure rules. remember that these rules apply to all numbers that are measurements. a car travels 6 miles north, 3 miles east, and then 2 miles south. what is the distance traveled? a.7 b.11

Which of the following statements is true of enzymes? a)they dont provide an active site for substrates to bind in a reaction b)they act on a specific type of substrate in a reaction c)they unusable after a reaction d)they change shape after a reaction

Explain why phospholipid molecules form a bilayer. (3 marks)