The length of a vertebrate's ______ determine its ability to concentrate urine.
a. axons
b. synapses
c. malpighian tubes
d. nephrons

Question

The length of a vertebrate's ______ determine its ability to concentrate urine.
a. axons
b. synapses
c. malpighian tubes
d. nephrons

anonymous · Answer

._. my thinking face

anonymous · Answer

its d? thats what i would say:P

anonymous · Answer

okay thanks

abhisar · Answer

It's very easy if you do it by elimination method. Axons and synapses are part of nervous system so they clearly can't be the answer. Now we are left with `Malphigian Tubes` and `Nephrons`. The former is the excretory organ found in insects (which are definately not vertebrates.) and the later is excretory unit found in vertebrates.