Which of the following is correct about a muscle contraction?

a. myosin heads attach to sites on actin filaments
b. myofibrils attach to z lines
c. sacromeres produce actin and myosin
d. atp causes fascicles to contract muscle fibers

Which of the following is not a symptom of desertification? a) decrease in salt content of the soil b) lowering of the water table c) reduced surface water d) increased soil erosion e) loss of native vegetation

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

Describe the relationship between isotonic solutions, equilibrium, and water movement into and out of a cell.