HELP How did farmers in marshy areas modify the environment to make it suitable
for farming?
A. They started raising cattle.
B. They irrigated the fields.
C. They drilled for oil.
O D. They dug drainage ditches.

Rainbow trout is non- native to the united states. however this species is breeding with the native gula yltrout acientistrecently observed that the hola trout were becoming exitinct what is the cause of their extinction