Which of the following statements is true? The earth's core is made of liquid metal. Convection currents in the mantle cause the movement of crustal plates. The earth's crust is very hard and strong. It is difficult for magma to break through. The presence of sedimentary rocks means the area was once near an active volcano.

How do tides affect the organisms living in intertidal zones? a. no organisms live in intertidal zones due to the tumultuous environment. b. the mechanical forces of the waves keeps the organisms clean. c. only plants live in intertidal zones because the animals float away with the waves and never return. d. the mechanical forces of the waves can dislodge the organisms from their habitat.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain

What is the next step in muscle contraction after the actin changes shape? (apex)