Which event could result in speciation?
a. A bird develops a mutation that affects the shape of its feathers.
b. A mouse is infected by a virus that changes its feeding cycle.
c. A fish produces eggs with DNA transcription errors.
d. A horse stretches to reach apples growing from a tall tree.
c. A fish produces eggs with DNA transcription errors.
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________ consume organic molecules to live.
A. Photoautotrophs B. Autotrophs C. Hemitrophs D. Heterotrophs E. Plants
Fish and shellfish account for what percentage of total protein consumed by the human population?
a. 6 b. 16 c. 26 d. 36 e. 56
Mendel accounted for the observation that traits that had disappeared in the F1 generation reappeared in the F2 generation by proposing that _____
A) new mutations were frequently generated in the F2 progeny, "reinventing" traits that had been lost in the F1 B) the mechanism controlling the appearance of traits was different between the F1 and the F2 plants C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1 D) members of the F1 generation had only one allele for each trait, but members of the F2 had two alleles for each trait
Which of the following are roles played by microbes in aquatic ecosystems?
A. Primary consumers B. Decomposers C. Producers D. Mineralizers E. All of these choices are correct.