Look at the diagram.

What is the next step in muscle contraction after the actin changes shape? (apex)

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Under the soviet system, the government a. controlled all forms of communication. b. allowed newspapers to print whatever they wanted. c. controlled editorials but not the reporting of news. d. encouraged access to a wide variety of news sources. select the best answer from the choices provided a b c d