I believe the stage of interphase in which cells copy their DNA is the S phase. :)
External fertilization is the correct answer.
Answer:
Sandstone does not react with Hydrochloric acid. The acid soaks into the rock because the rock is porous, filled with tiny holes. It is made up of tiny grains of sand cemented together by intense pressure.
Skeletal muscles are CELLS formed by skeletal muscle tissue, and the tissue is made up of skeletal muscle ORGANS. Hope that helps :)
