Sodium chloride breaks down into sodium and chlorine. why is this process classified as a chemical reaction?

a. change can only occur in one direction.

b. there is greater mass of the sodium chloride than there is of the products.

c. a substance has been changed into a different substance.

d. the number of sodium atoms in the product has increased.

How would you describe the the organisms in the second row of model 1 that are connected to the parents by a line

Read this summary of a scientific theory: "cells are the most basic structural and functional units of life. all living organisms are made up of one or more cells. all cells that are alive in the world today came from pre-existing cells." which of the following would require this theory to be modified? -a.) a survey finds that a majority of people believe viruses carry out the basic processes of life. -b.) a prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets. -c.) the dna of unicellular and multi-cellular organisms is shown to have many fundamental similarities. -d.) scientific observations show that microscopic organisms living in the deep ocean are not made up of cells.

100 points and brainlest its 6th grade work compare the parts of a cell and the cell as a whole to another common nonliving system (i.e., a car, a city,