Y Which factor is the primary trigger for the Tennessee warbler migrating
south to Central America?
O abundant food sources
O cold temperatures
O increased habitat
O moderate precipitation
Lenovo

O abundant food sources

Explanation:

Tennessee warbler migrating  from south to Central America due to presence of abundant food sources for the warbler. These birds lives in Central American forests which provides huge amount of food such as insects, moth caterpillars, fruit and nectar. This food is the main factor which is responsible for the migration of Tennessee warbler to these regions of United states.

d

explanation:

i think that this is the best answer, but im sorry if this is wrong

by 1880, germany had more rail lines than great britain and russia.