An element has 13 protons, 12 neutrons, and 13 electrons. what is the atomic charge? (hint: is it positive, negative, or neutral)

_tissues respond quickly to outside stimuli a) epithelia b)nervous c)muscular d)muscular and nervous

What is a food chain? a.different animals located in different communities b. energy transferred from the sun to plants and then to a series of living things c. rows of crops, such as lettuce, in a field d.animals using one another as food for energy and growth

Which of the following best demonstrates the unity among all organisms? matching dna nucleotide sequencesdescent with modificationthe structure and function of dnanatural selectionemergent properties