What is the meaning of the phrase "cascade of
oscillating species" as used in the following
sentence?
And as bees pollinate clover,
Darwin argued that this cascade of
oscillating species numbers would
result in more clover in fields in
areas where there are lots of feline
pets.
А
a steady decline in the number of species
in a given area, caused by environmental
shifts
a connected series of effects on species,
caused by a preceding change
an unpredictable fluctuation in species
populations, caused by unknown factors
D
an evolutionary cycle within species
populations, caused by a natural
progression