The presence of ________, a waterproofing protein, in epidermis prevents many microorganisms from gaining access to the body
A) keratin B) antibiotics C) lysozyme D) melanin E) sebum
Answer: A
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A high-affinity antibody binds nonspecifically and loosely to antigen
Indicate whether the statement is true or false.
When planting seeds, why should you plant more seeds than you expect to grow?
a. Animals may eat some seeds. b. Some seeds may not germinate. c. The wind may disperse some seeds to an unsuitable environment. d. all of these
Swordtail fish are known for the long extensions on the males' tails. What types of experiments might help you determine whether the females are using visual input about tail length to choose between males? (Check the best three)
_____ Add artificial tails of different lengths to females and determine their response to normal males. _____ Add artificial tails of different lengths to male platys (a similar fish without tail extensions), and measure female response. _____ Create artificial fish models with different size tails and measure female response. _____ Measure hormone levels in males who have different size tails. _____ Measure sperm count in males who have different size tails. _____ Trim the tails of male fish to different lengths and measure female response. 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 sexual selection behaviors? 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?
When ectoparasites first arrive and adapt to the fur or feathery habitat of a host, they often lose more complex ancestral features. So it is possible to gain a trait in evolution and subsequently lose it. However, it is considered vastly improbable that this same trait will again re-evolve. Therefore, in trying to trace evolutionary lineages, can we always expect the most primitive forms to be the simplest and the most advanced to be the most complex? Why or why not?
What will be an ideal response?