Alligators are predators that live in the florida everglades. a scientist is using a computer model to determine whether the alligator is a keystone species in the everglades. the graph shows the population of alligators in one of the computer simulations. the graph shows the population of alligators in a computer simulation. the population holds steady for the first two years, drops from 100 percent to 70 percent between year 2 and year 4, and drops from 70 percent in year 4 to 10 percent in year 6. the population reaches its low point in year 8, at 8 percent. then it begins rising again, to 12 percent in year 10, 20 percent in year 12, 36 percent in year 14, and finally, to 44 percent in year 16. the simulation also provides data for many other everglades species. which of these results would provide the strongest evidence that the alligator is a keystone species? a. the populations of many species increase and decrease in a similar pattern as the alligator. b. the populations of many species are always increasing, regardless of the changes to the alligator population. c. the populations of many species are always decreasing, regardless of the changes to the alligator population. d. the populations of other species are staying about the same, regardless of the changes to the alligator population.

Match the descriptions / definitions with the term they best describe 1. three dimensional relationship of the different polypeptide chains in a multisubunit protein or protein complex 2. common folding pattern in proteins in which a linear sequence of amino acids folds into a right-handed coil stabilized by internal hydrogen-bonding between polypeptide backbone atoms. 3. the amino acid sequence of a protein 4. a region on the surface of a protein that can interact with another molecule through noncovalent bonding. 5. three-dimensional arrangement of alpha-helices and beta-sheets within a single polypeptide, typically stabilized by a variety of noncovalent bonds, including ionic and hydrogen bonds, and nonpolar interactions / hydrophobic force. 6. the chain of repeating carbon and nitrogen atoms, linked by peptide bonds, in a protein. 7. common structural motif in proteins in which different sections of the polypeptide chain run alongside each other and are joined together by hydrogen bonding between atoms of the polypeptide backbone. 8. portion of a polypeptide chain that has a discrete tertiary structure of its own and can often fold independently of the rest of the chain 9. regular local folding patterns in a protein, including alpha-helix and beta-sheet a. primary structure b. beta-sheet c. protein d. coiled-coil e. polypeptide backbone f. secondary structure g. side chain h. tertiary structure i. binding site j. alpha-helix k. quaternary structure l. protein domain

The pharynx is the structure in the body that serves as a pathway of both air and food. how does the body make sure that food does not get into the lungs? the salivary glands secrete enzymes that pull food out of the air pathway. the small intestine pushes the air out of the digestive system. the pancreas breaks down food in the air pathway. the epiglottis closes the air pathway so that food will not enter it.

(6.02 mc)what affect do marine protected areas have on environmental quality? they increase environmental quality by preventing resource overuse. they increase environmental quality by adding new species. they decrease environmental quality by removing all human activity. they decrease environmental quality by adding recycling facilities.