The law of conservation of energy says (5 points)

energy can be created but not destroyed

energy can be destroyed but not created

energy cannot be created or destroyed

new energy is made only when needed

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.

Polar zones are cold and tend to be dry because of a pressure system of cold. low high

What properties of a substance determine how that substance will react when combined with other substances?