I get it!
a. carbohydrates - glycogen or starch (these are sugars)
b. proteins - hemoglobin or enzyme (these are examples of proteins)
c. lipids - cholesterol or fat
d. nucleic acids - DNA or RNA
Answer:
carbon and titanium, hope that helps
Explanation:
Runner B took about 13.3 mins per mile while Runner A took about 15 mins per mile so runner be ran faster
An exothermic action releases heat.