What two things must be present for a mechanical wave to form? a. Time & Energy
b. Energy & Resistance
c. Energy & a Medium
d. A Medium & Time

Which organism is the producer in this food web? 7th grade question. a) arthropods b) birds c) fungi d) plants

The unique structure of the neuron is dedicated to the efficient and rapid transmission of neural signals. the relationship between neurons, the spinal cord, and the brain constitutes an elaborate communication system throughout the human body. all but one of the functions listed below are a result of this interaction.

Which of these is the best source of stem cells and minimizes the risk with cell transplantation