One mechanism that some animals use to limit heat loss in cold environments is  

A.  vasoconstriction of veins.
B.  vasoconstriction of the precapillary sphincters in the skin.
C.  increasing cardiac output.
D.  vasodilation of below surface blood vessels.
E.  vasodilation of the near surface blood vessels.


B.  vasoconstriction of the precapillary sphincters in the skin.

Biology & Microbiology

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a. bound to GMP b. bound to GDP c. bound to GTP d. phosphorylated e. unphosphorylated

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The protein that carries oxygen in the red blood cells is

A. myoglobin. B. hemoglobin. C. actin. D. iron. E. insulin.

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The fact that during gamete formation, the segregation of alleles for a gene on one chromosome does not influence the segregation of alleles for a gene on another chromosome is Mendel's law of

a. random fertilization. b. crossing over. c. population dynamics. d. segregation. e. independent assortment.

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What is the significance of double fertilization in flowering plants? What will be an ideal response?

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