Do you think communities should try to establish colonies of bats under local bridges?

When organisms are classified ,they are given a two part name

List the advantages and disadavantages of the switch from persistent chlorinated hydrocarbon pesticides (such as ddt) to nonpersistent organophosphate pesicides. have the benefits of the switch outweighed the disadvantages? explain.

What is thought to have caused the mass extinction at the end of the cretaceous period?