13. Which organelle is important to preparing substances that are expelled out of a cell? a. Ribosomes
b. Smooth ER
C. Golgi bodies
d. Mitochondria

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Veins have a much lower blood pressure than arteries. which of these prevents backflow of blood in veins? a. pressure applied by the heart b. one–way valves in veins c. thin muscular walls of veins

In order to study genetic mutations, scientists must study genetic material. which statement describes the genetic material scientists are most likely studying? a) they study alleles that contain chromosomes, which are rna.b) they study alleles that contain genes, which are chromosomes.c) they study chromosomes that contain genes, which are dna segments.