Astudent human a cell with a microscope observes a cell wall a cell membrane and a nucleus the presence of these structures indicates that the student is looking at a cell from a
a. rabbit
b. carrot
c. worm
d. fly

Carrot. Good luck with the rest of your homework.

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 .

What are the choices?