Astudent in science class observes a cell under the microscope and sees an organelle that only appears in plant cells. what is the organelle?

Write a paragraph about why the respiratory system is important and we need to breathe easily. (guys i really need ) x(

Which of these pieces of safety equipment should be worn when operating a chainsaw

Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.