Japanese beetles and gypsy moths were accidentally introduced into North America. The most probable reasons these insects have become serious pests in North America is that they

Question

a have few natural enemies and can outcompete native species.

Ob are protected by Federal laws.

C were created in labs by scientists and are resistant to pesticides.

d became extinct in the late 1980s.

Answer 1

a have few natural enemies and can outcompete native species.