Name the element found in small amounts in the body that is needed to make hemoglobins for oxygen transport

Which would prevent a plant from growing? oa. lack of sunlightob. no supply of lithiumoc. too much waterd. too many monosaccharides

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

Aperson with age is more likely to catch diseases that healthy people usually don’t catch. what are these infections called?