.- La interacción más importante entre las poblaciones de un ecosistema está dada por el alimento, en la cual cada organismo lucha por conseguirlo a través de las cadenas alimenticias. De esta forma la materia y energía viajan de un organismo a otro

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 (blank) states that all loving things are made of cells.

When an object is moving away from you while still making a sound, the pitch of the sound is perceived to a. lower b. unchanged c. fluctuating d.higher