What is indicated by a similarity in the pattern of embryological development exibited by two diffrenr organisms

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

What did hunter gathers do to alter the environment?

Which of the following is a heterotroph?