Arms extend from the middle outwards and tube feet for oxygen

question 11 options:

segmented worms

arthropods

mollusks

sponges

echinoderm

Insects, arachnids, and crustaceans  

Insects have 3 body segments. (head, thorax, abdomen)

Have a hard exoskeleton made of chitin.

Appendages be used for feeding, defense, sensory and reception.

Invertebrate phyla that obtains oxygen by using gills (marine) or air tubes (terrestrial.)

Use pincers and stingers as attack weapons to defend themselves

Characterized by having jointed legs, segmented bodies, and sometimes wings

this protocol provides a detailed procedure for total protein extraction for western blot analysis from achieved samples following trizol isolation of rna.

the answer to your question is:

c. complementary base-pairing