Which componenet is missing from the process of cellular respiration? + Oxygen --> Carbon Dioxide + Water + ATP Energy (4 points)

a
Sunlight
b
Glucose
c
Oxygen
d
Carbon
me

Complete the sentence. the lower the hydrogen ion concentration, the the ph. higher lower closer to 7 closer to 0

Zoe is investigating the composition of substance a, an unknown substance. using chemical processes, she analyzes substance a and determines it is composed of sodium, oxygen, and hydrogen atoms in a ratio of 1 : 1 : 1. what is substance a? a. a compound b. an element c. a heterogeneous mixture d. a homogeneous mixture

Can someone me with questions 12 and 13 plz.