4. what are ecosystem services? why are ecosystem services'impacted when forests are over-exploited
for economic gain and what are the implications for human survival? what is your view on ecosystem
services as products to be traded in global markets?

Nerve cells are specialized to respond to stimulitrue or false?

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?

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?