Every fall, clusters of hundreds of danaus plexippus, or monarch butterflies, migrate into mexico. the traveling group of d. plexippus is one example of a(n)
a.
species
b.
ecosystem
c.
community
d.
biome

the true and correct answer is A.

9.9 years

a = p(1 + rt) . . account balance after time t at rate r starting with principal p

3000 = 2500(1 + 0.0202t) . . filling in the given numbers

1.2 = 1 + 0.0202t . . divide by 2500

0.2 = 0.0202t . . . subtract 1

0.2/0.0202 = t ≈ 9.901

it will take about 9.9 years for the account balance to reach $3000.