Which structure is unique to vertebrates?
limbs
brain
skin
backbone

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

All motion is caused by force? true or false

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .