What kind of animal uses a hydraulic system to move?
a. snails
c. shrimp
b. roaches
d. echinoderms

What can be found in every skeletal muscle? a. nerves, bones, cartilage, and connective tissue b. tendons, cartilage, nerves, and blood vessels c. muscle fibers, nerves, connective tissue, and blood vessels d. tendons, nerves, blood vessels, and bones

The united states uses which source of energy to produce almost 40 percent of its electricity

Which nutrient tends to cycle within a single ecosystem?