In which type of rock is the fossil imprint of a fern leaf most likely to be found? a. sedimentary b. metamorphic c. volcanic d. igneous

Which of the following explains why a tree is often used as a model to represent the principle of common descent

According to theories of how life began, how did early organic molecules begin to separate from the outside world? a: specialized enzymes were required b: chains of amino acids created a barrier c: formation of microspheres or vesicles d: rna catalyzed the formation of membranes

Fill in the blank with the correct sphere label. a: ⇒ geosphere b: ⇒ biosphere c: ⇒ hydrosphere