__________ allow animals of the same species to
share information. Fill in the blank(s) with the appropriate word(s).
Answer: Communication signals
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Why do vascular plants need phloem?
A. because they grow very tall B. because not all parts of the plant are photosynthetic
Glacier Bay in Alaska is a fjord whose lowlands were covered by glacial ice until around 230 years ago
As the glacier retreated, glacial till was exposed to plant colonization; remarkably (and fortunately for generations of ecologists), the location of the tip of the retreating glacier has been frequently documented since the late 1700's. This means that scientists have been able to develop a detailed timeline of the changes in the plant community, or _____ in Glacier Bay over time. A. ecological succession B. niche diversification C. niche divergence D. competitive exclusion E. none of these
All of the following are critical factors for DNA replication on the leading strand EXCEPT?
A. primer B. DNA ligase C. DNA polymerase D. DNA primase E. deoxynucleoside triphosphates
Old cultures of bacteria that have lost their ability to cause disease are said to be ________.
A. pathogenic B. virulent C. attenuated D. impotent