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Questions in biology

[Done] What is an independent variable?

[Done] Name the component of food whose digestion produces nitrogenous waste.

[Done] What happened to the water vapor when the Earth cooled 3 billion to 3.5 billion years ago? What formed?

[Done] Cartography is the science of...

[Done] An old woman joined a kilometer dash sprint and felt very exhausted afterward. How did the old woman affect her heart rate?

[Done] How do the characteristics of living things contribute to an organism's survival?

[Done] Which of the following steps is *not* critical in the creation of Bt corn? A. Cut out a piece of DNA from a DNA molecule. B. Splice a piece of DNA into DNA from another organism. C. Use a restriction enzyme to form sticky ends in DNA. D. Read the DNA sequence of the piece of DNA to be cut and spliced.

[Done] Molecular scientists can read the DNA code and compare the DNA of different organisms. This concept is used in molecular clocks to determine which of the following? A. Morphological relationships B. Molecular phylogenies C. Evolutionary relationships

[Done] What is the approximate height of the average adult in centimeters?

[Done] Air moves out of the lungs when the: (a) diaphragm relaxes and the rib cage moves inward. (b) air pressure inside the lungs is less than the external air pressure. (c) diaphragm contracts and the rib cage expands. (d) air pressure inside the lungs is the same as the external air pressure.