What do climatologist study about fossil seashells in rock sediments to learn about climate? the shapes of the shells
the ratio of magnesium to calcium in the shells
the strontium content
the chemical traces of alkenones

accomplishment : zachary taylor’s was a national war hero in his battle in an mexican war

explanation:

he was known as a national war hero for his battles in the mexican war, taylor was elected as the 12th president of the united states in 1849. he led the nation during its debates on slavery and southern secession. after serving only 16 months in office, taylor died from cholera morbus on july 9,

answer: in 1900, there were no "workplace safety laws"!

explanation: at the beginning of this century, workers in the united states faced remarkably high health and safety risks on the job.

a century ago in 1900 about three hundred out of every one hundred thousand miners were killed on the job each year.

[industria] developments occurred within a legal and regulatory climate that diminished employer’s interest in safety. as a result, americans developed production methods that were both highly productive and often very dangerous.

hamas is the terrorist group present in palestine.terrorism has been a feature of life in israel even before the country's establishment in 1948.as per israeli government, 3200 people have died in terrorist attacks.

in january 2007, meshal stated that hamas would consider recognizing israel once a palestinian state was established. a haaretz story noted, "this is the first time that a hamas official has raised the possibility of full and official recognition of israel in the future." according to the story, prime minister ehud olmert "shrugged off" meshal's statement.

in december 2010, hamas announced it would honor any palestinian referendum that approved a peace plan with israel. "we accept a palestinian state on the borders of 1967, with jerusalem as its capital, the release of palestinian prisoners, and the resolution of the issue of refugees," said haniyeh. "hamas will respect the results [of a referendum]," he added, "regardless of whether it differs with its ideology and principles." zvi bar'el, a leading haaretz political analyst, noted: "not a return of refugees, not the destruction of the state of israel, no preconditions.