As part of his science fair project, Jacob needed to measure the length of the pods produced by sweet
pea plants grown under various conditions.
Which of the following procedures is likely to be the
most accurate?
O A. Jacob will trace each pod and measure the
tracing.
O B. Jacob will line all of the pods up along a
meter stick and measure the total. He will
then divide by the number of pods he
measured.
C. Jacob will measure one pod. He will then
compare the known pod to the other pods
and estimate the difference.
O D. Jacob will use a ruler to measure the pea
pods directly.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.

in the year 2850, humans successfully colonized mars. the martian modules that were constructed could hold only a small population of people. it is now a century later, and the population on mars has grown to 600 people. of the current mars population, 45 people express the recessive phenotype for phenylketon- uria (pku) syndrome (pp genotype).

explanation: