In reference to the Phylum Echinodermata, what is a water
vascular system?
A. a network of water filled canals that help with
locomotion and gas exchange
B. the body plan that allows water to pass through to filter
feed
C. a thick layer on the outside of the organism that
protects it from dehydrating in the salt water

compost can be added to topsoil as a:

pesticide

digestion

it excretes wastes

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .