Which of the following is a feature of all cells? O A. All cells have a nucleus.
O B. All cells have a rigid cell wall.
O C. All cells are spheres.
O D. All cells have a cell membrane.

Ivan is looking at a cross section of a stem taken from a vascular plant. he sees two different types of vascular tissue: the xylem, which is closer to the center of the stem, and the phloem, located around the xylem, closer to the outside of the stem. how do these two structures work together in a living plant?

What do transitional fossils best support?

To take a whiff of your favorite food, you use both? a. motor nerves and your digestive system b. sensory nerves and your immune system c. motor nerves and your skeletal system d. sensory nerves and your respiratory system