Examine the molecular models of two different substances below. in the molecule on the left, the electrons are not shred equally. in the molecule on the right, the electrons are shared equally.

What statements describe a host organism?

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

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