Hel people !!

why are coral reefs important name 2 reason ??​

Providing immunity by injecting the body with a weakened form a pathogen is known as

Why do bacteria thrive even in hostile environments

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