A) bats.
B) mice.
C) skunks.
D) mosquitoes.

A) Declining small mammal species diversity is linked with increasing hantavirus infections in deer mice.
B) A study in Panama found that experimentally reducing small mammal diversity decreased hantavirus infection in individuals of hosts species.
C) Increasing deer mouse populations has been found to trigger the transmission of Sin Nombre virus infections in humans.
D) Species diversity could buffer the transmission of zoonotic pathogens to wildlife and ultimately humans.

A) They arrived in North America from ballast water discharged into the Great Lakes.
B) They are predators that hunt their food.
C) They usually do not foul infrastructure.
D) They can dramatically increase populations of phytoplankton.