In India, we have our own species of cockroach Blatta orientalis. But now we can see only American species Periplaneta americana.
A. What is the reason for this condition?
b. Give another example for the same condition.
c. Mention other causes for biodiversity losses.

Explanation

a. This is due to the exotic(alien) species introduction.
b. Nile perch introduced in lake Victoria of East Africa led to the extinction of about 200 species of cichild fish.
c. 1. Habitat loss and fragmentation
2. Over exploitation
3. Co-extinctions.