Complete the table, make graph on
second slide, and
answer questions on
third slide.
Solid material that is dissolved in seawater is referred to as salts. Salts make up about 3.5 percent of
the mass of seawater. The following chart lists the major dissolved salts that are present in seawater and
identifies the number of grams of each salt contained in 100 grams of water.
Salts Most Abundant in Sea Water
Dissolved Salts
Sodium chloride (NaCl)
Magnesium chloride (MgCl)
Magnesium sulfate (MgSo.)
Calcium sulfate (CaSO)
Potassium sulfate (K, SO)
Calcium carbonate (CaCo.)
Magnesium bromide (MgBr.)
Approximate Mass (in grams per 100 grams of
sea water)
2.72
0.38
0.17
0.13
0.08
0.01
0.008
1. Use the following equation and the information contained in the chart to calculate the percentage that each
dissolved salt represents of the total mass of dissolved salts found in seawater. Enter your data in the
appropriate space provided in the Data Table. Use the data to make a Bar Graph
Percentage of the total = Mass of dissolved salts (grams) x 100
mass of dissolved salts
3.5 grams
Percentage of Total
Mass of Dissolved
Salts
Dissolved Salts
Sodium chloride (NaCl)
Magnesium chloride (MgCl)
Magnesium sulfate (MgSO)
Calcium sulfate (Caso.)
Potassium sulfate (K, SO)
Calcium carbonate (CaCO)
Magnesium bromide (MgBr.)

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.

Match the reproductive structures based on their function and the system to which they belong. egg ovary sperm vas deferens vagina fallopian tube testis urethra

2polnis which of the following is an advantage of an in vitro experiment?me