Which of the following must occur for speciation to happen?

How does using straws hurt the sea turtles?

Adigestive system that is a series of tubes beginning at the mouth and ending at the anus is a digestive system.

Some birds look for food near cattle and other livestock. the movement of the cattle churns up the ground, making insects available to the birds. the cattle appear to be unaffected by the presence of the birds. what kind of relationship exists between the birds and the cattle? o a. parasitism o b. commensalism o c. predation o d. mutualism