Atp is a compound produced by the body to:
a. break down proteins
b. attack materials foreign to the body
c. carry oxygen to the cells of the body
d. be used as a source of energy when needed for a reaction

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

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

Fungi are classified into how many groups? a. 1 group b. 2 groups c. 3 groups d. 4 groups