Which part of this model represents a layer made of liquid rock that produces a magnetic field?

A. D
B. A
C. B
D. C

If a || b and e || f, what is the value of y ?

The wave shown on the electromagnetic spectrum disturb the medium it passes through a)different frequency. b)the same frequency .

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.