What does a counter current blood flow supply for cetaceans?
a. It transfers oxygen
b. It conserves body heat.
c. It increases circulation.
d. It improves mobility.
b
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A fly embryo that expresses the bicoid mutant phenotype
A. is genetically wild-type, but has a bicoid mutant mother. B. is mutant for bicoid and has a bicoid mutant mother. C. may be either genetically wild-type or mutant for bicoid, but definitely has a bicoid mutant mother. D. can be either genetically wild-type or mutant for bicoid. The genotype of the mother cannot be determined from the information provided. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about maternal genes? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect 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?
In human females, one of the sex chromosomes is switched off during early development in a
phenomenon called a. karyotyping. b. X inactivation. c. X linkage. d. crossing over. e. SRY activation.
Biosphere II is a huge dome-covered self-contained structure located outside Tucson, Arizona. Biosphere II was built to try to duplicate Earth's biosphere and ecosystems in miniature and to use the information gained from the experiment to help design similar habitats on the Moon and Mars. The habitat contained small versions of many of Earth's ecosystems, including an ocean with a coral reef, mangrove wetlands, a grassland, a desert, an agricultural system, and a human habitat. Eight men and women were sealed inside the habitat for a proposed two-year stay. The air, water, and food for the "biospherians" all came from inside the sealed habitat, and their only contact with the outside was through computers and telephones. Before the two years were up, however, the experiment failed.
Supplemental oxygen was pumped into the facility and food supplies were provided through the airlocks. What caused the failure of the experiment? It was traced to nutrient pollution. The soil in some of the biosphere ecosystems was unusually rich in nutrients. These excess nutrients caused a huge population explosion in decomposer bacteria, which led to oxygen depletion. How could a population explosion of bacteria lead to oxygen depletion? What will be an ideal response?
The cells of an aging animal function less efficiently because
A) organelles and cellular components decline. B) protein synthesis ceases. C) damaged DNA cannot be repaired. D) cell metabolism is slower. E) cells can no longer mitotically divide.