How to do this question plz answer me

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 should be the strand of complementary dna produced by the strand of dna shown below cgt ata

What processes would you expect to be key in the production of yogurt ?