A(n) _____ is a chemical partnership between a weak acid or base and its salt
a. covalent bond c. buffer
b. hydrogen bond d. pH
C
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Which category of plant second metabolites includes stimulants like caffeine, nicotine, and cocaine?
A. tannins B. alkaloids C. phenolics D. cyanogenic glycosides E. terpenes
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
_____ long tubular flowers _____ flowers are colored violet and blue _____ blooming time of the flowers coincides with the arrival of the hummingbirds _____ flowers produce a high volume of nectar and sugar _____ flowers are low to the ground Clarify question: What is the key concept addressed by the question? What type of thinking is required? Gather Content: What do you already know about coevolution? What other information is related to the question? Choose Answer: Given what you now know, what information is most likely to produce the correct answer? Reflection on Process: Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Although they lived at different times, all of the following people performed experiments related to how life originated. The strongest support for biogenesis came from
A. Miller. B. Fox. C. Pasteur. D. Needham.
Reptiles evolved from ________ ancestors and were abundant by the ________ period.
A. echinoderms; Cambrian B. fish; Devonian C. amphibians; Permian D. mammals; Carboniferous