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

Diego conducted an experiment to find out what kind of ball bounces the highest when dropped from a five-foot platform. he used a golf ball, a tennis ball, and a soccer ball. he dropped each ball from the balcony once. diego recorded his observations after each drop. what can diego do to best improve the reliability of his results? a) drop each ball from the platform three more times b) record his observations in more than one unit c) write at least two scientific questions after the experiment is complete d) share his results with other people who have done similar experiments you for the !

20 the compound al(nh3)2 has atoms of nitrogen.

Energy for use in cells is stored in form of 1.chemical bond energy 2.physical energy 3.heat energy 4.mechanical energy.