02:20:27 Read this excerpt from part 5 of Zeitoun.
Albo
Progress is being made. It's so slow sometimes, so terribly so sometimes, but progress is being made. We
have removed the rot, we are strengthening the foundations. There is much work to do, and we all know what
needs to be done. We can only do the work, he tells Kathy, and his children, and his crew, his friends, anyone
he sees. So let us get up early and stay late, and, brick by brick and block by block, let us get that work done.
Which word best describes the tone of this excerpt?
sentimental
optimistic
supportive
O demanding
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Which of the following represents the chemical reaction of hydrazine and hydrogen peroxide to produce nitrogen and water? a. nitrogen + hydrogen peroxide → hydrazine + water b. nitrogen + water → hydrazine + hydrogen peroxide c. hydrazine + hydrogen peroxide → nitrogen + water d. water + hydrogen peroxide → nitrogen + hydrazine

Stephen is a student who wants to test his knowledge of medical terminology. which option could he use?

Archeologists have discovered three sites showing conclusive evidence for the mastery of fire in tanzania, from a period slightly after the time that homo habilis was present in africa. these sites clearly were founded by homo erectus, the descendent species of homo habilis that migrated north, out of africa and into asia. homo erectus was known to have mastered fire, from ample evidence at sites in asia. there is no reason to attribute mastery of fire to homo ergaster, the descendent species of homo habilis that remained in africa.which of the following is an assumption on which the argument depends? (a) before their migration, homo erectus occupied african territory as far south as tanzania.(b) the strain of migration provided the selective pressure motivating homo erectus‘ mastery of fire.(c) homo ergaster would not have derived as much benefit from the mastery of fire as did homo erectus.(d) homo ergaster inherited all cultural knowledge from homo habilis, a species that did not have mastery of fire.(e) homo ergaster did not occupy regions as far south as tanzania until well after the time of these three sites.