Which of the following describes an ecosystem with the most biodiversity? a. A backyard has grass, an oak tree, and a lilac bush. Squirrels live in the oak tree and robins
make nests in the lilac bush.
b. A backyard has grass, dandelions, an elm tree, and a rose bush. Rabbits nest in the grass and
two kinds of bees visit the rose bush.
c. A backyard has grass, native purple coneflowers, and three oak trees. Squirrels live in the oak
tree and two kinds of butterflies and three kinds of bees visit the coneflowers.
d. A backyard has grass, native purple asters, milkweed, and bluestem grass. Three kinds of bees
and four kinds of butterflies visit the milkweed and aster flowers. Red-winged blackbirds visit
the bluestem grass.