Explain why naming and describing species based only on their appearance can be problematic
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In some cases, individuals that look the same are actually different species. For example, the cordilleran flycatcher and the Pacific slope flycatcher look so similar that birdwatchers have difficulty telling them apart, but they are two different species that do not interbreed. In other cases, individuals that look very different are the same species. For example, the myrtle warbler and Audubon's warbler were once classified as separate species because they have different-colored throat feathers, but they are the same species.
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Negative feedback mechanisms regulate
a. Prostaglandins b. Steroids c. Very few hormone d. Most if not all hormones
Dandelions and tent caterpillars, which are r-strategists, are examples of opportunistic species that tend to move in high numbers and rapidly occupy new environments.
Answer the following statement true (T) or false (F)
Which of the following is true about eukaryotic replicons?
a. They are activated in linear order across a chromosome. b. They are generally over 2 Mb in length. c. Generally, replicons in heterochromatin replicate last. d. They are all replicated at the same time during S phase. e. They have distinct, conserved termination regions.
What name is given to the bond between water molecules?
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