How does contraction of the diaphragm cause the lungs to fill with air?
What will be an ideal response?
When the diaphragm contracts, it pulls downward, enlarging the pleural cavity. The increase in volume leads to a drop in pressure. The air outside is at higher pressure than the air inside the lungs, filling the lungs with air.
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Domestication of dogs has led to
A. a variety of homologous structures. B. a variety of phenotypes. C. a variety of mutations. D. a variety of reproductively isolated breeds. E. a variety of different species.
Milk is a type of protein, so cells that secrete milk likely have lots of which organelle?
a. ribosomes b. nuclei c. cytoskeleton d. cytoplasm
What is the function of the lateral line system?
A. To protect the gills B. To provide buoyancy C. To extract oxygen from the surrounding water D. To detect movement in the surrounding water
Pea fowl (peacocks and peahens) show sexual dimorphism -- males have long blue-green tail feathers with eyespots, while females have short brown tail feathers. Which statement best describes the graphed data about peacocks?
A. There are no peacocks with less than 140 eyespots.
B. The fewer eyespots that a peacock has in his tail, the more mates he attracts.
C. Actually eyespots have very little to do with mate-attracting activities.
D. The more eyespots that a peacock has in his tail, the more mates he attracts.
E. There are no peacocks with more than 165 eyespots.
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? 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?