Ahydrogen atom that los s its electron and becomes positively charged is called a(n)

The image shows embryos of three vertebrate classes

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?