Which of the two are the less dense material shown?

material mass volume
rock. 1000. 0.5
pillow. 200. 10
bottle of soda. 2000. 2
loaf of bread. 100. 1

a) loaf of bread and pillow
b) rock and bottle of soda
c) bottle of soda and loaf of bread
d) loaf of bread and rock

What will happen to a population of predators if there is a sudden, temporary increase in the number of prey? a. the population of predators will be uniform with no change. b. the population of predators will increase first and then decrease slowly. c. the population of predators will increase continuously.

What is the most abundant vertebrate on earth?

Vinegar has a ph of 3, and household ammonia has a ph of 11. is the concentration of h+ greatest in the vinegar or ammonia?