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What occurred during the oxygen revolution that occurred 2.3 billion years ago?

Which property of life is depicted by the following description? A baby calf was born at about 31 kg, but after 5 years the adult kangaroo now weighs 45 kg.

The figure to the right shows an outcrop of sedimentary rock whose strata are labeled A-D. If the fossils of two closely related species were found in stratum A, then fossils of their most recent common ancestor are most likely to occur in which stratum? fossil layers 1.png

Finish the following sentence to correctly describe how antibiotic resistance arises. When a population of bacteria is treated with antibiotics…

25 males consume protein powder before working out daily and 25 males don’t consume protein powder before working out daily. Muscle mass is measured after 30 days. What might be considered a standardized variable?

20 people take a multivitamin daily and 20 people take a placebo daily to test whether taking a multivitamin daily causes fingernails to be stronger. People who don’t take the multivitamin daily would be considered the…

Evolution through natural selection is considered a scientific theory because…

How many grams of silver carbonate (Ag2CO3, Molar Mass = 275.75g/mol) will precipitate when excess ammonium carbonate, (NH4)2CO3, is added to [x] mL of [y] M silver nitrate (AgNO3) solution? 2AgNO3(aq)  +  (NH4)2CO3(aq)  

The pressure of hydrogen sulfide gas in a container is [x] Pa. What is the pressure in torr? Report your answer to the ones place (no digits behind the decimal point) and do not include units in your answer! Chapter 6 Equations: 1 atm = 760 torr        1 atm = 760 mmHg        1 atm = 101325 Pa        1 atm = 14.7 psi R = 0.08206 L.atm/K.mol density =

The class room number is