En la zona tropical recibimos

Are substances released into the environment that in excess amounts cause damage

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

Aplant may open end close its stomata to prevent excess water loss and maintain