Both the father and his child drinks water that flowed through lead pipes and the child gets lead poisoning but the father does not. Explain how this could be possible.

Both mistletoe and Spanish moss live in many trees in Florida. However, mistletoe is considered a partial parasite, whereas Spanish moss is commensal. They both survive quite well, but some of the trees they live in do not.

Transportation of goods is one of the most important issues of agriculture trade, as the speed of delivery and preservation of quality are directly related.

What might happen to the food web below if the number of phytoplankton drastically decreased? The small fish and wading birds would be affected. Only the small fish would be affected. The small fish, bivalves, and invertebrates would be affected.

If a peptide was composed entirely of alpha-helical structure and found to contain an integer number of complete turns, which of the following would be a possible number of amino acid residues in the peptide? A) 36 B) 60 C) 20 D) 32

Which of the following statements is false? Protists are eukaryotes. Some protists can conduct photosynthesis. Protists can reproduce by fission. Protists are all unicellular.

Which is a renewable resource? A) coal B) sunshine C) gasoline D) natural gas

How are fitness and adaptation important to natural selection?

Where do the light-independent reactions of photosynthesis occur? A. Stroma B. Thylakoids C. Cell cytoplasm D. Intermembrane space

What causes pioneer grasses and weeds that have grown in an abandoned field to die?

What specific event triggers the uncovering of the myosin binding site on actin?