Read the excerpt from "Marine Mammals."
Why does the author use classification to help guide
readers through this part of the text?
Marine mammals are classified into four different groups:
cetaceans (whales, dolphins, and porpoises), pinnipeds
(seals, sea lions, and walruses), sirenians (manatees and
dugongs), and marine fissipeds (polar bears and sea
otters)
-"Marine Mammals,
National Oceanic and Atmospheric Administration

A. It helps the author define the term "marine mammals."

B. It helps the author identify types of marine mammals.

C. It helps the author describe what marine mammals look
like.

D. It helps the reader visualize the types of marine
mammals.
ITS NOT D

did you ever get an answer? i'm on the same question : (

to and without are prepositions, so a, b, and d are prepositional phrases. the adverb phrase is c, about the surprise.

explanation:

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

i believe that is the truth if thats what you where asking for