The function of the cell wall is to A. make a organism rigid
B. provide internal support for an animal
C. control substances going in and out of organisms
D. make a plant cell rigid ​

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space

One similarity and one difference between an element and a mixture of elements