How old was the world thought to be when Darwin began his voyage? How old is it thought to be now? What will be an ideal response?
ANSWER: When Darwin left, the world was thought to be about 6000 years old and that humans had
essentially existed since the beginning. Darwin's contemporary Lyell suggested the Earth
was millions of years old based on geological processes. We now know the Earth to be
closer to four and a half billion years old.
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Molecular studies suggest microsporidia appear to be most closely related to members of which fungal
phylum?
a. Glomeromycota b. Basidiomycota c. Chytridiomycota d. Zygomycota e. Ascomycota
If an isotope's half-life is 100 years
A. in 50 years, only half of the atoms in a sample of that isotope will remain. B. that isotope will no longer exist in 50 years. C. that isotope will no longer exist in 200 years. D. in 200 years, only half of the atoms in a sample of that isotope will remain. E. in 100 years, only half of the atoms in a sample of that isotope will remain.
Which property of water molecules is
responsible for movement of water from roots to leaves in a plant?
a. hydrophobicity b. temperature stability c. fusion d. solvent polarity e. cohesion
In what part of a cell would you find most of a cells genetic material
a. Plasma membrane b. Cytoplasm c. Nucleus d. Mitochondrion e. Centrosome