Which type of environmental scientist is likely to study the effects of pesticides on pigs?
a. ecologist
b. oceanographer
c. environmental veterinarian
d. environmental physician

Possibly A. Ecology would consist of how nature interacts; food cycle, energy cycle, ecological interaction, ETC. However how this would be relative towards ecological matters is due to how both interact. It's Parasite to Host. Which would mean it's parasitism; which would consist of something having a dependence of another organism. Parasitism is a form of ecology, because it describes the relationship towards organisms. 

He should put sand around the spill in order to contain it so that it won't spread

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein