Which type of muscle is responsible for constricting the walls of blood vessels?
a. striated involuntary muscle
b. striated voluntary muscle
c. nonstriated involuntary muscle
d. nonstriated voluntary muscle

In addition to seeds, which of the following characteristics are unique to the seed-producing plants? a) sporopollenin b) lignin present in cell walls c) pollen d) use of air currents as a dispersal agent e) megaphylls

Which is one example of a phenotypic change that is not genetic

Which label identifies the part of the atp molecule that changes when energy is released in the cells of all living things