The fundamental cause of sickle-cell disease is a change in the structure of:

Natural selection results in which of the following? a. adaptive change b. adaptive species c. adaptive evolution d. new species

Which of the following is a biotic factor? sunlight worms water climate

During the Ordovician period, it is believed that the sea levels dropped due to the movement of the continents. This event led to the extinction of over 50 percent of all life on earth. This event occurred about A) 5 billion years ago.

Pavlov's classical conditioning research contained an element of serendipity because Pavlov a. did not recognize the importance of what he found. b. discovered this learning process through intuition. c. intended to study stomach secretions. d.

If George (120 pounds) and Ron (130 pounds) ran up the steps in the same amount of time, which one had the most power?

If an enzyme-mediated reaction were carried out at a temperature that was higher or lower than optimal, the vmax for the reaction would probably be

Which of the following is not a mechanism of microevolution? Group of answer choices migration (gene flow) natural selection speciation genetic drift

What weather factor is also a measurement of energy held within the air? Humidity Pressure Temperature Wind

What is the probability that, in an organism with a haploid number of 12, a sperm will be formed that contains all 12 chromosomes whose centromeres were derived from maternal homologs?

The growth rate of a local population is dependent on the birth rate minus the death rate and