Flycatcher birds that migrate from Africa to Europe feed their nestlings mostly with moth caterpillars. The data presented show the mean dates of egg laying, hatching, and fledging of flycatcher young, and the 1980 and 2000 peak mass of caterpillars.

The most likely cause for the shift in caterpillar peak mass is

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#Question id: 19460

#Unit 13. Methods in Biology

In phase contrast unobstructed light passes through a region of________ that both transmits only a small percentage of the light and changes its phase slightly.

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#Question id: 15144

#Unit 4. Cell Communication and Cell Signaling

For the stimulation of B-cell responses

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#Question id: 23161

#Unit 13. Methods in Biology

A classically used fluorescent dye which emits a orange light is?

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#Question id: 27358

#Unit 6. System Physiology – Plant

Choose the correct statement regarding singlet and triplet state

1. singlet state is short lived, net angular momentum and spin quantum number, s is zero

2. singlet state is long lived, net angular momentum and spin quantum number, s is one

3. Triplet state is long lived , net angular momentum and spin quantum number, s is one

4. Triplet state is short lived net angular momentum and spin quantum number, s is zero

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#Question id: 12342

#Unit 10. Ecological Principles

Which of the following is a biological attribute that would most likely allow a species to become cosmopolitan in distribution?