Catalase is an enzyme that protects human cells from damage by helping convert the toxin hydrogen peroxide (H2O2) into water (H2O) and oxygen
(O2). A student is investigating how different pH values and different
temperatures affect catalase activity. The table below shows the student's
data. Which of the following test tubes has the physical conditions most
similar to human cells?

What causes the force that pushes magma from the magma chamber through the pipe and vent of a volcano?

Which structure in the cardiovascular system connect arteries to veins?

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.