Organisms in kingdom archaebacteria live in environments that are very hot or very cold. which other characteristic is common to organisms in this kingdom?
a.
they are viruses.
b.
they are green.
c.
they live without oxygen.
d.
they are multi-cellular.

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The independent variable is the type of music.the dependent variable is the pulse rate.the intervening variable is the age of the subject.if the mother does not like rock, her pulse is likely to not increase.the same might be true for the sister.the friend may like rap and gets excited.to establish cause/effect relationship, all of the subjects must be consistent.hope i .

13) a 14) a15) b16) i don't know sorry17) a (maybe)