Scientists study systems that have different scales of size. Which is the smallest system of the choices below?
A. study of sun and moon movements to predict tides
B. study of blood samples to learn about an unknown disease
C. study of exoplanets to examine the origins of the solar system
D. study of air and water conditions to find the causes of hurricanes

Which of the following is true about fossils? a. the relative age of fossils cannot be determined from their position in sedimentary layers. b. fossils found in lower layers of sedimentary rock are as old as fossils found in upper layers of sedimentary rock. c. fossils found in upper layers of sedimentary rock are older than fossils found in lower layers of sedimentary rock. d. fossils found in lower layers of sedimentary rock are older than fossils found in upper layers of sedimentary rock.

Where does oxidative phosphorylation take place

Find a formal factor that connects egypt to africa to europe and to southwest asia