A hummingbird drinks nectar from a flower and carries its pollen to other flowers. What is this an example of?

a.) defensive mutualism

b.) parasitism

c.) commensalism

d.) dispersive mutualism

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?

Examine the air pressure map. which type of line is shown on the map?

What are ways that ordinary people can to keep antibiotic resistance from getting worse?