Question 1. scientists form hypothesis to answer questions.
accurate
short
mathematical
testable
question 2. scientists experiments to make sure the results are meaningful.
perform
repeat
conclude
communicate
question 3. a good hypothesis
is always true.
is always a guess.
is not simply a guess.
none of the above
question 4. two essential parts of a good experiment are
the control group and a single variable.
the control group and the outcome.
two variables.
two control groups.
question 5. in an experiment, the experimental treatment differs from the control treatment only in the being studied.
experiment
variable
hypothesis
data
question 6. a sample size should be enough to give an accurate estimate for the whole population.
large
small
strong
heavy
question 7. a group of individuals or events that have been selected to represent a population is known as a
team.
species.
family.
sample.
question 8. models used by scientists include
conceptual models.
variable models.
physical models.
both a and c.
question 9.a conceptual model represents a way of thinking about
relationships.
variables.
data.
positions.
question 10. to fully understand a complex environmental issue, we really need to consider
economics.
values.
scientific information.
all of the above

Me plz he did not infringe upon the policy making powers that he felt the constitution gave congress. but the determination of foreign policy became preponderantly a presidential concern. when the french revolution led to a major war between france and england, washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-british. rather, he insisted upon a neutral course until the united states could grow stronger. which provides the best objective summary of this excerpt? president washington made a good choice when he decided not to accept the recommendations of his advisors and instead insisted that the united states stay neutral during the war between france and england as president, washington believed that the united states should remain neutral in foreign policy even though he had advisors who recommended that he take sides during the war between france and england. washington did not make policy decisions during his presidency because he did not want to interfere with the policy-making powers that the constitution gave congress. washington refused to accept entirely the recommendations of either his secretary of state thomas jefferson, who was pro-french, or his secretary of the treasury alexander hamilton, who was pro-britis

Which of the following types of pollution is most responsible for large numbers of deaths worldwide because of unsafe drinking water? (a) nutrient pollution (b) thermal pollution (c) pathogen pollution (d) sediment pollution

Achange in which factor will affect the rate of reaction only when gases are involved? temperature pressure surface area concentration