17. Which of the following best explains Reversed Polarity? a. A physical movement of the North Pole southward
b. A magnetic field aligned with the earth's present-day magnetic field
c. A daily fluctuation in true north
d. A magnetic field aligned in the opposite direction as the earth's present-day magnetic field
e. A reversal of opinions by scientists as to the existence of magnetic poles

i'd say that the moon rock is about 2.2 billion years old.

one centimetre is equal to 0.01 metres

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.