Over the past 100 years, the decrease in deaths due to infectious disease has been somewhat offset by an increase in death due to metabolic diseases.
Answer the following statement true (T) or false (F)
True
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Which one of the following statements about carbon is correct?
A. Each of carbon's three valence electrons shares a bond with another atom. B. Carbon-carbon single bonds allow for free rotation around the bond; carbon=carbon double bonds do not allow for free rotation around the bond. C. The spacial orientation of carbon's bonds results in carbon resting in the center of a three-dimensional structure referred to as a hexahedron. D. Carbon is not only the most abundant element on Earth; it is believed to be the most abundant element in the universe. E. Single bonds between carbon atoms are typically shorter than double bonds between carbon atoms.
An abundance of nitrogen (N) and phosphorus (P) in an aquatic environment leads to __________ levels of dissolved oxygen due to _________
A. high; the oxidation of water B. high; the abundance of anaerobic bacteria C. low; reduction of oxygen D. low; high aerobic respiration
A microbe is discovered growing near a deep sea thermal vent. When researchers bring a sample up to the surface and try to grow it in a lab at room temperature in a normal incubator, they are unsuccessful. Why?
A. The pressure isn't the same at sea level as it is on the ocean floor. B. Oxygen concentrations are very different between the two environments-it's possible the microbe is a strict anaerobe and is poisoned by the air (oxygen) in the lab. C. Salt concentrations might be different in the media the researchers are attempting to use and the salt water the microbe is used to living in. This might be causing osmotic pressure differences that the microbe can't tolerate. D. The temperature is probably different-the thermal vent would be very hot, while these researchers are trying to grow this microbe at room temperature. The enzymes in the cells are probably outside of their normal operating range at room temperature, and therefore nonfunctional. E. All of the above.
You find a notebook that has lots of equations, tables, and graphs in it. The tables have columns for the number of female offspring born over a year, the number of deaths over a year, and the number of individuals in various age classes. What subject do you think the owner of the notebook is studying? What type of tables are they most likely using?
A. demography; life tables B. iteroparity; life tables C. iteroparity; survivorship tables D. growth ecology; transition tables E. demography; survivorship tables