An old movie poster used a quote "In space, no one can hear you scream!" Which of these best explains this quote? A) The quote is incorrect, you can hear sound in outer space. B) Sound cannot be polarized. So, you cannot hear sound in space. C) Sound is an electromagnetic wave and needs no medium to travel through. D) Sound needs a medium for the wave to vibrate and there is nothing in space to vibrate.

What substance is the most acidic. lemon juice. tomato juice. sodium hydroxide. water

Juan and carol were studying invertebrates in biology. they knew that segmented or earth worms preferred a dark, moist habitat. during this lab, they would be investigating the responses of organisms called planaria or dugesia tigrina. these were simple flatworms that still had a one-way digestive system and a very simple nervous system. juan and carol placed the planaria in a petri dish containing cool, distilled water that was partially covered with black paper. they shined a light on the dish. next, they removed the paper and placed a small amount of chicken liver at one end of the dish. they added a few large salt crystals to the water. finally, they added drops of hot water to the cool water in the petri dish. their results can be seen in the data table. according to their experiment, all but one conclusion is valid.

What is the most abundant vertebrate on earth?