Tectonic plates are able to move because of

a) sliding of the continents toward the oceans

b) gravitational differences between different parts of earth as it revolves around the sun

c) relatively dense oceanic crust sinking into the weak asthenosphere at subduction zones

d) the sinking of the continents into oceanic crust at the mid-ocean ridge

Up until 1938, paleontologists accepted the idea that coelacanths (an ancient fish) went extinct at the time that they last appear in the fossil record, about 80 million years ago. but in 1938, a live coelacanth was discovered off the coast of south africa that was compared to the fossil record and found to be the same species what goal of science does this discovery represent

Which best describes a gene? a. a sister chromatid b. a chromosome c. a tetrad d. a piece of a chromosome

Which of the following is a testable hypotheses?