The major types of ecosystems in the world, each comprised of a characteristic array of plant and animal life, are called A. biotic environment
B. biomes
C. ecotones
D. physical ecosystems

there are 35 white marbles

step-by-step explanation:

y- yellow marbles

4y + 5 = 45

subtract 5 from both sides

4y = 40

divide for from both sides

y = 10

plug in 10 to get 40 yellow marbles then subtract by 5 to get 35 marbles

thus there are only 10 yellow marbles

b brown mice / white sand dunes