Two species of flour beetles, Tribolium castaneum and Tribolium freemani, are competing according to the Lotka‒Volterra equations. If the α of T. freemani on T. castaneum is 1, the addition of 150 T. freemani individuals would depress the T. castaneum population growth rate by the same amount as the addition of T. castaneum individuals would.

There are fewer than 100 naturally occurring elements in the universe, but there are millions of different unified substances. explain how this can be true.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.

The big bang theory suggest that the universe is about - 300 million years old - 4.6 billion years old - 30 billion years old - 13 billion years old