What is a soil with roughly equal amounts of humus, silt, clay, and sand called?
a. a topsoil
b. a loam
c. a subsoil
d. a compost
Ans: b. a loam
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Which type of bird is most likely to benefit from air sacs which reduce its weight?
A) birds, such as geese, which migrate great distances B) birds that chip away wood, such as woodpeckers C) diving birds D) birds that rip apart prey, such as hawks and eagles
What feature of genetic mutations can eventually lead to the evolution of new species?
A. Mutations always produce harmful effects. B. Mutations never affect protein structure or function. C. Mutations are not a mechanism through which biological evolution occurs. D. Mutations always produce beneficial effects. E. Mutations produce changes in the DNA sequence of a gene.
Suppose two genes a and b are 7.4 map units from each other, and that genes b and c are 5.7 map units from each other. You do a cross to determine the map distance between a and c. Which result would indicate that c lies between a and b?
a. 2.0 map units b. 11.1 map units c. 14.8 map units d. 15.0 map units
Technology is the __________ .
Fill in the blank(s) with the correct word(s).