7. Which statement about the use of independent variables in controlled experiments is correct?
a A different independent variable must be used each time an experiment
is repeated.
b. The independent variable must involve time,
c. Only one independent variable is used for each experiment.
d. The Independent variables state the problem being tested

Suppose that on a small island off the coast of scotland, 32 percent of the population has blue eyes, which means that these individuals must be homozygous for the blue eye color gene (bb). the only other eye color found on the island is brown, and individuals that are homozygous for the brown eye color gene (bb) or heterozygous (bb) will have brown eyes because brown is the dominant gene. assume this population is in hardy-weinberg equilibrium. if 100 babies are born next year, how many of these would you expect to have brown eyes and be heterozygous? a. 58 b. 49 c. 29 d. 43

Which part of the spine is likely to cause a nerve signal to travel faster? a. backbones b. white matter c. nuclei d. gray matter

How far away is the nearest black hole from earth?