Which of the following best describes a possible carbon compound? One carbon atom forms a quadruple bond with another carbon atom. One carbon atom forms a double bond with an oxygen atom and two single bonds with two hydrogen atoms. One carbon atom forms five single bonds with five hydrogen atoms. One carbon atom forms a triple bond with another carbon atom and a double bond with an oxygen atom.

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.

Where is most of the fresh water on earth found a in the ocean b in glaciers and in ice caps c in rivers d in the soil