A male peacock has enormous tail feathers that it uses in mating displays to attract females. While the tail feathers are an

A. The feathers require a lot of energy to produce.
B. Bright feathers make males less susceptible to predation.
C. The large tail feathers would make it easier to fly.
D. The feathers make the male more attractive to other males.
E. There are no disadvantages to having large tail feathers.


A. The feathers require a lot of energy to produce.

Biology & Microbiology

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Control of gene expression  

_____  allows bacteria to adapt to changing environments. _____  is critical for development in multicellular organisms. _____  allows bacteria to replicate without control. _____  allows multicellular organisms to maintain homeostasis. _____  it stops multicellular organisms functioning as a whole.

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In a lipid bilayer, the _____ of all the lipid molecules are sandwiched between all the _____

a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails

Biology & Microbiology

Using the data in Figure 53-3, the cause of the decline of the wolf population in 1982 was:a

a sharp decrease in food supply. b. a decrease in the intrinsic rate of increase for the wolf population. c. competition with a newly introduced predator. d. introduction of a disease organism. e. cannot be determined from the data provided.

Biology & Microbiology

You have fractured your bone and your physician is explaining the healing process to you. She tells you that after the blood clot forms, the next step is the development of the callus. Which of the following describes the structure of the callus?

A) osteoclasts B) compact bone C) cartilage D) spongy bone

Biology & Microbiology