Which of these is most likely true for two organisms, a and b, in competition? a. a feeds off b and b is harmed b. both a and b feed off one another c. both a and b are deprived of a resource d. a gains a resource and b is deprived of it

Which phrase is the best summary of the model shown? a. the transfer of the sun's energy through trophic levels b. a series of aerobic and anaerobic reactions c. a transformation of light energy into chemical energy d. the breakdown of food molecules

How far down have geologists drilled holes ? (science) a: 3.8 km b: 12 km c: 100 m d: 1200 km

24. how are vaccines used to keep people healthy?