What is the most abundant animal in soft-bottomed communities?
a. Whelks
b. Brittle stars
c. Polychaetes
d. Mussels
b
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The movement of carbon from CO2 in the atmosphere to HCO3 - (a byproduct of chemical weathering) on rocks to CaCO3 in coral skeletons and finally CaCO3 in limestone are all steps in the _____________
A. short-term carbon cycle B. nitrogen cycle C. sulfur cycle D. long-term carbon cycle
Evolution, viewed on a small scale, as it relates to changes in a single gene or allele frequency in a population over time, is called
A. macroevolution. B. speciation. C. genetic evolution. D. phenotypic evolution. E. microevolution.
In vascular plants, sugars are transported throughout the plant by ____
a. sclerenchyma b. phloem c. collenchyma d. parenchyma e. xylem
Why do people tend to get shorter as they age?
a. they hunch over due to fatigue b. their bones become shorter c. their muscles become shorter d. the intervertebral disks deteriorate e. the vertebral height diminishes