may be harmful when people compete to see who can hold their breath the longest under water. Without oxygen, brain cells??

What types of energy transfers and energy transportations are involved in the domino chain reaction?

Which way do the nitrogenous bases in dna pair up? a. a and g; t and c b. a and c; t and g c. a and t; g and c d. a and a; t and t; g and g; c and c

During photosynthesis, hydrogen ions are most directly used to in the chloroplast pictured above. a) make glucose b) make chlorophyll c) produce carbon dioxide d) drive the production of atp