A penguin's feet are nearly as cold as ice, while the bird's core body temperature is much higher. Which of the following explains this observation?

What will be an ideal response?


countercurrent heat exchange between warm blood in arteries and cold blood in veins

Biology & Microbiology

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Eukaryotic DNA methylation occurs on which base?

A. guanine B. cytosine C. thymine D. adenine E. thymine and adenine

Biology & Microbiology

The boreal forests of North America are dominated by ____

a. spruce, fir, and pine b. redwoods and sequoia c. birch and aspen d. long-leaf and loblolly pines e. cedars and junipers

Biology & Microbiology

Which piece of information is communicated by courtship displays?

A) The individuals are of the same species and of the opposite sex. B) The male represents a threat to other males. C) The individuals intend to hurt each other. D) The individuals are of different species.

Biology & Microbiology

You analyze 300 offspring and see the following:30 recombinants between gene A and B  120 recombinants between genes B and C  90 recombinants between genes A and C  Which of the following is the correct order of genes A, B, and C?

A. Gene order can be ABC, BAC, or BCA.   B. Gene order is BAC C. Gene order is ABC D. Gene order is ABC or BAC E. Gene order is BCA

Biology & Microbiology