After the physician taps your knee with a small hammer, your lower leg “jumps” in a reflexive response. The muscles of your leg then send messages back to the spinal cord to let it know that the leg has been extended. This two-way form of communication is called a(n) .

How are the testes and ovaries similar? a. both produce sex cells. b. both connect internal reproductive organs to the exterior. c. both transport sex cells from their site of production. d. both store mature sex cells.

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration

What kinds of foods are high in lipids?