Unicellular protista with two flagellum that are photosynthetic and cause red tides are called a)amoebas b)ciliates c)dinoflagellates d)euglenoids

How are gene and protein sequences used to classify organisms?

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

1) what three conditions must be present for minerals to form through natural processes? 2) why are minerals considered inorganic substances? 3) how do oxides differ from other minerals that contain oxygen atoms? 4) how is a sulfide different from a sulfate? what makes native elements unique?