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An optimal time to use imagery is:

If the tallest and shortest individuals of a population of humans do not survive and reproduce as well as the individuals of “average” height, which type of selection would most likely result? 

In a very small population of birds, assume 5 out of 20 alleles are the type that codes for blue feathers. What is the allele frequency of the “blue feather allele” in this population?

The figure shows a position-time graph of an object moving along x-axis. t2=2 s, t3=4 s, x1=10 m, x2=18 m, x3=32 m.  What is the velocity of the object from time t2 to t3. Express your answer in m/s. Note that velocity can be negative or positive.

Which trait provides a survival advantage?

  Based on the evolutionary tree shown above, which two organisms are most closely related?

Sue realizes that she performs poorly on tests because she gets so anxious that she loses confidence.  She wants to improve her test taking and for weeks before her next test she imagines sitting down to take the test while remaining calm, in control, and totally confident.  The preceding is an example of:

In one butterfly species, the colors of individuals range from white to black, with many shades of gray in between. If the butterflies in a mountain population become more and more similar in color over several generations (e.g., if most butterflies are the same shade of gray), what kind of evolutionary force is likely acting on the population?

An object is thrown vertically upward from a height of y1= 10 m with an initial velocity of v0 ​ = 72 m/s. The position versus time graph is shown in the figure.  What is time t3? Express your answer in seconds (s).

Two species of garter snakes live in the same geographic area. One lives mainly in water and the other mainly on land; therefore, they rarely encounter each other and do not interbreed. What type of isolation is this?