In which phylum do organisms have both jointed appendages and an endoskeleton?
a.
sponges
b.
vertebrates
c.
annelids
d.
arthropods

For which pair of objects would adding the same a

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

Two solutions of the same uv-absorbing molecule were analyzed by uv-vis spectroscopy on the same instrument using 1 cm pathlength cells. use data from the table to calculate by what percentage the concentration of solution b is compared to that of solution a.sample absorbance at 315nm a 0.45 b 0.80