The laws of conservation of mass states that when a chemical reactions takes place some atoms are lost because they disappeara)true b)false

Which type of respiration takes place when there is no oxygen present

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

The diagram shows a chicken embryo and a human embryo