Ahumor piece in a reputable medical journal notes that people can't tell for sure whether parachutes are safe and effective because there has never been a properly randomized, double-blind, placebo-controlled study of parachute effectiveness in skydiving. suppose a researcher were designing such a study.

complete parts 1 and 2 below.

1)what is the factor in this experiment?

a. jumping with or without a parachute
b. the parachutes
c. how the parachutes are distributed to the skydivers
d. the skydivers

2) what experimental units should be used?
a. different brands of parachutes b. airplanes
c. volunteer skydivers
d. the research team

4.06 hc)a five-year review of threats to the southern resident orca population of the united states concluded that the top threats were prey availability, contaminants, and effects from recreational and whale watching vessels. further down the list are oil spills, disease, and effects from commercial vessels not targeting whales. how might this list be different if it were for transient whale populations, which have a larger average population size and live farther offshore in open waters? a)the transient population is more likely to be affected by contaminants. b)the transient population is less likely to be affected by whale watching vessels. c)the transient population is more likely to be affected by disease. d)the transient population is less likely to be affected by prey availability.

What was the land like over 500 million years ago? what was under the sea?

Select the correct answer. a chestnut-colored horse mates with a white-colored horse to produce a brown and white spotted offspring. what is the type of inheritance pattern?