What are the two main types of energy?
a. radiant and chemical
b. thermal and radiant
c. potential and chemical
d. kinetic and potential

Milk production during breastfeeding is increased by the suckling of a newborn from his mother's nipple. this type of feedback mechanism best describes a positive or negative

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?

Which type of landforms forms at the plate boundary as a result of divergent stress