What are the different levels of organization of life?

Which statement correctly describes a way that mutations increase the likelihood that a species will survive in a changing environment

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?

Describe characteristics of a good respitory surface