Adeveloping embryo is beginning to develop a male or female reproductive system and all major organs. during which period does this happen

When organisms are classified ,they are given a two part name

What is the 77 element on the periodtic table

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