The graph shows atmospheric carbon dioxide levels over time, Atmospheric CO, Levels
(Mauna Loa Observatory)
Monthly values
Normalized values
Parts per million
380
360
340
320
1960 1970 1950 1990 2000 2010
Year
Graph and data copyright Scription of Oceanography,
NOAA Earth System Research Laboratory, December 2016
Which two observations are most useful for explaining the trends in the data? Select two answer choices
Photosynthesis and cellular respiration have opposite effects on carbon dioxide levels
Carbon is stored in solid form in shells rocks and sediments
Atmospheric carbon dioxide may dissolve in ocean water,
The burning of fossil fuels adics carbon dioxide to the atmosphere.
Activities that produce or take up carbon dioxide vary with the seasons

Guinea pig coat color is determined by a single gene. the allele for black coat color is dominant to brown. in a cross between twoblack-haired guinea pigs, 20 offspring are born. if both parents were heterozygous, probability would predict that approximately howmany of the 20 offspring would have brown hair?

Astudent from one of the research labs is having trouble preparing a slide for examination and photographing. the bacterial slide that he has brought to you was prepared using a commercially purchased stain. he has asked for your in determining what he is doing wrong so that he can change the lab protocols and continue on with his project. after examining the slide under oil immersion, you determine that no bacteria are present even though the student is able to show you the culture he used to make that slide that has visible growth in the liquid medium. which of the following statements does not explain the fact that there are no bacteria present on the student’s slide? by not allowing a glass slide to completely air dry before heat fixation, the flame will cause the surrounding water to boil and this will damage the bacterial cell. overheating during the fixation step boiled the water within the bacterial cells and resulted in the cells bursting. insufficient heating of the slide did not drive out the thin layer of water and this resulted in minimal bonding between the bacteria and the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide. rinsing with alcohol during the washing step stripped the bacteria off the glass slide.

When the solution concentration on the outside of a cell is greater than thesolution concentrate on the inside of the cell, what type of solution is the cellwithin?