All life on Earth shares a genetic code. This statement is often used to support common ancestry of life on Earth. Which of these statements are able explain what is meant by that statement? Select ALL that apply.

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

The response is the basis for vaccination. primary secondary tertiary none of the above

What percentage of light hits earth's surface directly?