Distinguish between smooth endoplasmic reticulum and rough endoplasmic reticulum. O Rough endoplasmic reticulum has ribosomes attached to its surface.
O Smooth endoplasmic reticulum has vacuoles attached to its surface.
O Smooth endoplasmic reticulum has ribosomes attached to its surface.
O Rough endoplasmic reticulum has vacuoles attached to its surface.

The ultimate purpose of respiration: a. inhale 02 and exhale co2 b. place oxygen in the lungs c. place oxygen in the blood d. deliver oxygen to every blood cell

An uncomfortable feeling in the ears when descending in an airplane is caused by changes in air pressure on the: a. inner ear b. middle ear c. eardrum d. hammer/anvil

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas