Gas exchange in an echinoderm takes place through
a. book lungs.
b. skin gills.
c. lungs.
d. none of the above.

Arepair man charged $93.06 the price included 2 hours of labor and 40 service charge how much does the repairmen charge per hour for labor?

Select the situation bellow that would produce a total displacement of zero. a. a trip to the moon and then to mars b. a horse galloping from one end of a field to another c. the criss-crossing path of a bug as it flies from flower to flower d.a round-trip ride to school and back

Describe characteristics of a good respitory surface